B2 – Lesson 1 Keeping Healthy • Brainstorm how we get ill How do we get ill? Infections - Objectives and Outcomes At the end of the lesson students will be able to: • State 3 types of micro-organism (D) • Explain why you get symptoms when you have an infection or disease (C) • Discuss the health risks associated with infections (B) The Importance of Hygiene Why should you wash your hands after using the toilet? What are Pathogens? Micro organisms that cause disease. What are Microbes? • Living things are called __ __ __ __ __ __ __ __ __ . • Tiny organisms can be made of only __ __ __ cell. • We call them __ __ __ __ __ organisms. What are Microbes? • Micro-organisms are some times called microbes for short. • We can not see them with our eyes… Do we use a microscope or a telescope to see them? Telescope Microscope What Diseases do you know of? What causes Disease? Different Types of Microbes There are three types of microbes: microbes bacteria viruses fungi What are microorganisms? • Fungi • Bacteria • Viruses Small... ...smaller... ...smallest! Why do bacteria and viruses make you ill? Symptoms of disease are caused by damage done to cells or by toxins they make. In suitable conditions micro-organisms can reproduce rapidly into large numbers! Which is not a microbe A, Fungus B, Bacteria C, Virus D, Organ What do you call a disease causing microbe? A, Antigen B, Pathogen C, Capsicum D, Pathostem What does not cause symptoms of disease A, Damage to Cells B, Toxins C, Rapid reproduction of the pathogen D, High temperature Microbe Viruses Bacteria Fungi Size Structure How Reproduce Picture 5 minute breather • Video of TV ad campaign for Sti’s http://www.youtube.com/watch?v=HzmWaYHHRPA True or False? 1. 2. A person can have an STI and not know it Once you have had an STI and have been cured, you can’t get it again 3. A pregnant woman who has an STI can pass it on to her baby 4. Most STIs go away without treatment, if people wait long enough 5. STIs that aren’t cured early can cause sterility 6. Birth control pills offer protection from STIs 7. Condoms can help prevent the spread of STIs 8. If you know your partner, you can’t get an STI 9. A sexually active woman should get an annual pap test from her doctor 10. Chlamydia is a type of STI 11. Only young people can get STI What is under your fingernail?? • There are lots of things in the world around us that you cannot see with your own eyes. • There are living things made of many cells • And there are living things made of only one cell Microbes are micro organisms that are too small to be seen. A pathogen is a microbe that can cause diseases if it enters the body: Micro-bugs vs Bacteria Microbug on a Human hair Human hair Bacteria Is that as small as microbes get? Nope: Viruses are even smaller Lesson 1: Infectious diseases Copy and complete: Infections are caused by some ____________ that invade the body. Microorganisms are ______, ________ and _______. When disease microorganisms get inside your body, they _______ very quickly. This causes _______ - the ill feelings. Symptoms can be caused by 1. ______________________ 2.______________________ Virus Reproduction - What’s the Order? Infect nearby cells and repeat the process. Use the cell contents to replicate (form thousands of identical copies) Viruses are taken into cells in the body Damage the cell as they burst out and Virus Reproduction - What’s the Order? 1. Viruses are taken into cells in the body 2. Use the cell contents to replicate (form thousands of identical copies) 3. Damage the cell as they burst out and 4. Infect nearby cells and repeat the process. B2 lesson 2 Microbe attack LO: to know what parts of your body stop microorganisms getting in [C] and how the body fights off micro-organisms when they are inside [B] 8C Defence! Fighting disease If microbes do enter our body they need to be neutralised or killed. This is done by WHITE BLOOD CELLS: White blood cells do 3 things: 1) They eat the microbe (phagocytosis) 2) They produce antibodies to neutralise the microbe 3) The produce antitoxins to neutralise the poisons produced by microbes Producing antibodies You’re going down Step 1: The white blood cell “sees” the antigen (microbe) Step 2: The cell produces antibodies to “fit” the antigen Step 3: The antibodies fit onto the antigens and cause them to “clump” Step 4: The antigens are “eaten” by the white blood cells Brainpop – Immune system 8C Immunity Quick Questions White blood cells ready to fight…….......? Red blood cells carrying…….........? Story Board Rules Task : in pairs draw a story board that illustrates the two methods white blood cells use to fight infection • 5 mins brainstorm and discuss • 20 mins • Must contain GOOD science • Must use keywords – antigen, antibodies, immune, phagocytosis, • Pages 92-93 • • • • • • • • • • • • • • • Antigen Infection Antibody White blood cell Immunity Fungi Phagocytosis Engulf Red blood cell Memory cell Lymph nodes Pathogen Virus Bacteria Microorganism BINGO In GCSE science exams they like to test your MATHS skills... Calculate the population growth of microorganisms given appropriate data EXAMPLE:Revisium biologus is a bacterium that reproduces every 20 minutes. If 10 R.biologus bacteria are left for 2 hours, how many bacteria will there be at the end of this period? There are some simple steps to work this out... Immune System LO: to understand the different roles white blood cells can play in fighting off disease [C] calculate population growth of microorganisms [B] explain why white blood cells create antibodies [A] (STS: 2) Mix and match • • • • • I cause thrush I provide antibodies I cause AIDS I am smaller than fungi but bigger than a virus I only kill bacteria and fungi mini test • • • • • 6 = A* 5=A 4=B 3=C 2=D C A disease causing microbe A A change in the environment What is a pathogen? D B Fungi, Bacteria and Viruses A type of medicine Which of these is NOT a first line of defence against disease? A C Mucus White blood cells B D Skin Stomach acid Which picture shows a virus? A B C A low number of species which are adapted to survive in low oxygen concentrations D What do ALL microbes need for optimum growth? Moisture Warmth A Nutrients B Carbon dioxide C Oxygen Alkali Nutrients D Warmth Moisture Moisture Warmth Nutrients What does ‘phagocytosis’ mean? B A Fossilisation The immune system C A WBC engulfing (eating) a microbe D To get better quickly after infection Fighting disease If microbes do enter our body they need to be neutralised or killed. This is done by WHITE BLOOD CELLS: White blood cells do 3 things: 1) They eat the microbe (phagocytosis) 2) They produce antibodies to neutralise the microbe 3) The produce antitoxins to neutralise the poisons produced by microbes Producing antibodies You’re going down Step 1: The white blood cell “sees” the antigen (microbe) Step 2: The cell produces antibodies to “fit” the antigen Step 3: The antibodies fit onto the antigens and cause them to “clump” Step 4: The antigens are “eaten” by the white blood cells Specific antibodies Antibodies are specific – they will only neutralise the microbe they have been made for. Once we have made an antibody to recognise a particular microbe, ‘memory cells’ can make that antibody again very quickly, therefore protecting against that microbe in the future IMMUNITY 20 minutes fighting off infection Outcomes: produce a story board that explains how our white blood cells create antibodies to fight off infection. Success Criteria: C – create a labelled diagram for each stage B – explain in words what is happening A – use 8 scientific words in your explanation Stages (not in correct order) •Antigens eaten •Antigens seen •Produces antibodies •Clump together EXTENSION •Draw a diagram to represent WBC making antitoxins to neutralise the poisons produced by microbes Key Words White blood cell Microbe Antibodies Antigen Engulf Specific Antitoxins Pathogen Phagocytosis Immune Memory Cells Neutralised 8C Immunity Worksheet - Bacteria and viruses can grow EXPONENTIALLY ... reproduction period 1 reproduction period 2 3 4 In GCSE science exams they like to test your MATHS skills... Calculate the population growth of microorganisms given appropriate data EXAMPLE:Revisium biologus is a bacterium that reproduces every 20 minutes. If 10 R.biologus bacteria are left for 2 hours, how many bacteria will there be at the end of this period? There are some simple steps to work this out... Exam Question (hard) 3 marks – pick from the following • number of bacteria after 2 hours is 12 800 (or 1.28 x 104), which is a sufficient number to cause food poisoning • idea that if conditions were not optimum the actual number may be lower than this • idea that not enough data/evidence/information, or would need to measure more things, to conclude that person will definitely get food poisoning • idea of immune response against bacteria or toxins / acid in stomach destroying bacteria or toxins Graphs – yuck! (but a popular question) Discuss with your partner what I show. Concentration of antibodies in blood 2nd exposure to the same MO 1st exposure to MO 10 days 25 days 0 10 20 30 40 50 Time (days) 60 70 80 90 End of lesson quiz Turn to the back of your book and put 1 to 5 in the margin. The questions will pop up, answer them as quickly as possible. Quiz questions 1. Name the 3 main types of microbes 2. 3. Which organ uses acid to kill microbes? What do white blood cells make to fight microbes? 4. What P is a disease causing microbe? 5. What does engulf mean? 5 correct A 4 correct B 2-3 correct C 1 correct D Drug Testing LO To know the main stages of drug testing and the ethical and validity issues of being in a drugs trial STARTER If you were ill and you were asked to take part in a trial for a new drug what questions would you ask before deciding if you would be involved. write three questions spiders on drugs video Drug Testing Leaflet Create a leaflet that is all about testing new drugs. On it describe the 3 main stages of testing a new drug On your leaflet explain the following key terms in clinical trials and why they are important: a. double blind trial b. blind trial c. a placebo. d. random groups e. the control group C A disease causing microbe A A change in the environment What is a pathogen? B Fungi, Bacteria and Viruses that do not cause disease D A type of medicine What is a double blind trial? A C Even the scientist don’t know who got the real drug The patients are testing eye drops B D The scientists know who gets the real drug Both the scientists and the patients know the treatment being used What is a blind trial? A The trial has psychological effects B The patients don’t know if they have been given the real drug C A low number Even the scientist of species which aredon’t adapted knowto survive in low who got the oxygen concentrations real drug D The patients are testing eye drops What is a placebo? A C An 90’s indie band A fake treatment to eliminate psychological effects B D A real test drug used in medical trials A type of white blood cell What is an open-label trial? A A fake treatment to eliminate psychological effects B Both the scientists and the patients know the treatment being used C An unethical trial D Even the scientist don’t know who got the real drug Heart Disease LO - To know the risk factors associated with heart disease. You are part of a double blind trial for a new drug and you are given the placebo. Explain what this means in words a year 7 would understand. Task: create an informative poster for use in a doctors surgery on how to reduce your risk of heart disease. • Include information on: – Diet – Smoking – Drugs – Stress – Alcohol – Epidemiological Studies - extension HEART DISEASE (T or F) • • • • • • • • • • Heart attacks are common in the UK Only men have heart attacks. Young people don’t have heart attacks. Smoking increases your risk of heart attack. Heart attacks happen when arteries to the heart are blocked. Heart attacks are always fatal. When you have a heart attack, some of your muscle dies. Heart muscle dies when it doesn’t get oxygen. Any fat in your diet is harmful. Being overweight puts a strain on your heart. Calculating Microbial Growth and Antimicrobial Resistance Starter - Which is riskier? Nuclear Power or Peanut Butter? HEART DISEASE (T or F) • • • • • • • • • • Heart attacks are common in the UK Only men have heart attacks. Young people don’t have heart attacks. Smoking increases your risk of heart attack. Heart attacks happen when arteries to the heart are blocked. Heart attacks are always fatal. When you have a heart attack, some of your muscle dies. Heart muscle dies when it doesn’t get oxygen. Any fat in your diet is harmful. Being overweight puts a strain on your heart. Worksheet - Bacteria and Viruses can grow EXPONENTIALLY ... reproduction period 1 reproduction period 2 3 4 In GCSE science exams they like to test your MATHS skills... Calculate the population growth of microorganisms given appropriate data EXAMPLE:Revisium biologus is a bacterium that reproduces every 20 minutes. If 10 R.biologus bacteria are left for 2 hours, how many bacteria will there be at the end of this period? There are some simple steps to work this out... EXAMPLE:Revisium biologus is a bacterium that reproduces every 20 minutes. If 10 R.biologus bacteria are left for 2 hours, how many bacteria will there be at the end of this period? • Step 1: work out how many minutes there are! 2 hours = 120 minutes • Step 2: work out how many reproduction periods that will be! 120 minutes÷20 minutes = 6 reproduction periods • Step 3: work out the number of bacteria after the first reproduction period 10 R.biologus (at start) x 2 = 20 R.biologus • Step 4: work out the number of bacteria you’d have after the second reproduction period 20 R.biologus x 2 = 40 Step 5: keep going until you have done all 6 reproduction periods! You could use a table... EXAMPLE:Revisium biologus is a bacterium that reproduces every 20 minutes. If 10 R.biologus bacteria are left for 2 hours, how many bacteria will there be at the end of this period? Reproduction period Number of bacteria 1 10 R.biologus x 2 = 20 2 20 R.biologus x 2 = 40 3 40 R.biologus x 2 = 80 4 80 R.biologus x 2 = 160 5 160 R.biologus x 2 = 320 6 320 R.biologus x 2 = 640 <<< ANSWER!!! Exam practice 1 Huguntis flavis is a bacterium that reproduces every 30 minutes. If 5 H.flavis bacteria are left for 3 hours, how many bacteria will there be at the end of this period? Exam practice 2 Vicitus diosilus is a bacterium that reproduces every 10 minutes. If 12 V.diosilus bacteria are left for 40 minutes, how many bacteria will there be at the end of this period? EXTENSION - Exam practice 3 Krispeecremus donutus is a bacterium that reproduces every 45 minutes. If 15 K.donutus bacteria are left for 4.5 hours, how many bacteria will there be at the end of this period? Exam Question (hard) 3 marks – pick from the following • number of bacteria after 2 hours is 12 800 (or 1.28 x 104), which is a sufficient number to cause food poisoning • idea that if conditions were not optimum the actual number may be lower than this • idea that not enough data/evidence/information, or would need to measure more things, to conclude that person will definitely get food poisoning • idea of immune response against bacteria or toxins / acid in stomach destroying bacteria or toxins Antibiotic Resistance Superbug Video 15 mins to make a postcard for a doctors surgery on antibiotic resistance Circulation and the Heart LO - To know the role of the heart and how it works You are part of an open label trial for a new drug. No one is given a placebo. Explain what this means in words a year 7 would understand. Give an ethical reason why open label trials are used in developing new drugs. The heart Double circulatory system Our circulatory system is in two parts. It is in fact called a double circulatory system. This section of the system including the right side of the heart, deals with the deoxygenated blood. Lungs Body cells This section of the system including the left side of the heart, deals with the oxygenated blood. Blood from the lungs pulmonary vein Atrium Blood from the lungs Blood squeezed through valves into… Blood from the lungs …the ventricle Blood from the lungs …goes to the body Blood from the lungs… Aorta Aorta pulmonary vein Blood from the body Vena cava Atrium …to the lungs Aorta Vena cava Copy picture Aorta Vena Cava The human circulatory system Video and Dissection Valves These valves are rather like doors that only open in one direction. blood valve The main valves in the heart The Circulatory System There are 3 types of blood vessels Arteries Veins Capillaries Blood vessels • This is a system of tubes that transport blood around the body. • Vein – carries blood towards the heart • Artery – carries blood away from the heart • Capillaries – really small blood vessels Arteries and Veins Artery thick layer of muscle and elastic fibres thick outer layer Vein thin outer wall thin layer of muscle and elastic fibres Arteries • These carry blood AWAY from the heart (Think Arteries Away = AA) • They are buried deep in the body • They carry oxygen rich blood (except for the pulmonary artery!) Veins • These carry blood IN to the heart • (Think veINs=IN) • They carry oxygen poor blood (except for the pulmonary vein!) Capillaries • These carry blood to the cells • They are narrow vessels running throughout the body • They carry oxygen rich blood from the arteries, past the cells. The oxygen poor blood is then carried to the veins. Can you label the blood vessels? 1. Artery, capillary, vein, 2. small lumen, large lumen, very small lumen 3. Single cell wall, thick elastic wall, thin wall Plenary - The Circulatory System Arteries Veins Capillaries Which of these blood vessels: 1. Takes blood away from the heart? 2. Carries oxygenated blood? 3. Contains blood under high pressure? 4. Is only 1 cell thick? 5. Contains valves? What is the effect of alcohol on the heart rate of Daphnia? Starter – label your Daphnia diagram What is your independent variable? What is your dependent variable? What variables will you keep the same? Why? What will you do to make your results reliable (repeats)? What will you do to make your results accurate (measurements)? How many results will you need to collect to make the investigation valid? What is the effect of alcohol on people? What effect do you think the alcohol will have on the heart beat of Daphnia? What equipment will you need? What is the effect of alcohol on Daphnia? Planning My independent variable that I will change is ______ . My dependent variable that I will measure is _______. To make it a fair test I will keep ______ , __________, _____________ , and __________ the same. Results Alcohol % Attempt 1 Attempt 2 Attempt 3 average The equipment that I will need is _________________ ___________________________________________ ___________________________________________ Method I predict that ________________________________ __________________________________________ __________________________________________ Conclusion As the amount of alcohol in the water increased ________________________________________________ When there was the most alcohol in the water _________________________________________________ When there was the least alcohol in the water _________________________________________________ My conclusion about the effect of alcohol on Daphnia is __________________________________________ ______________________________________________________________________________________ I think in humans alcohol __________________________________________________________________ Who’s urine? MATCH UP! Normal diet Drunk plenty of water Has been exercising but not drunk anything Title - Homeostasis Learning Objective To be able to explain how our bodies control water content. Learning Outcome • Homeostasis involves making sure that our bodies have the correct levels of 4 key things. • Can you name two of them? What is Homeostasis? Homeostasis involves maintaining a constant environment in the body • Homeostasis makes sure our body has the correct levels of; Temperature Water Carbon dioxide Oxygen B2 : How does the body control water balance? In Out Food and drink Breath Our bodies need a balanced water level to keep the Water madeconcentration in respiration Sweat internal of our cells at the correct level for them to work properly. Faeces Urine The kidneys Kidneys do two main jobs: 1. Remove waste urea from the blood. 2. Keep a balance of other chemicals in the blood – including water. How kidneys work Filtering all small molecules from the blood. Reabsorbing all of the glucose. Reabsorbing as much salt as the body needs. Reabsorbing as much water as the body needs. Excreting the remaining urea, excess water and salt as urine, which is stored in the bladder. Water balance The concentration of blood plasma is monitored as it passes through the brain. If the blood is too dilute then kidneys excrete more water in the urine. If the blood is too concentrated then kidneys excrete less water in the urine. The amount of water in the blood depends on: external temperature, exercise, intake of fluids and salts. ADH and water balance. The concentration of urine is controlled by a hormone called ADH (anti-diuretic hormone). It is released into the bloodstream by the pituitary gland. Blood too concentrated – detected in brain ADH secreted by pituitary gland ADH causes kidneys to reabsorb more water to blood Water Balance Normal blood concentration Blood too dilute – detected in brain Normal blood concentration ADH not secreted by pituitary gland kidneys reabsorb less water to blood TITLE: Controlling Water Content Outcomes: create a think board on homeostasis and water balance. Which hormone controls water content in the body? How do the Kidneys help keep water in the body balanced? Where is it released from? (C) What 3 main things can effect the concentration of urine? (D) Draw a flow diagram of how the concentration of urine is controlled by a hormone Explain in as much detail as possible (use as many science key words as you can) how Alcohol and Ecstasy affect ADH production (B) (A) True/False Quiz! FALSE • Your urine is always the same. TRUE • The pituitary gland monitors blood plasma. • Homeostasis maintains a constant internal environment. • The liver helps balance water and TRUE waste in the Dehydration body. TRUE Drowning • Alcohol suppresses ADH production. • Ecstasy increases ADH production. TRUE FALSE Which is the odd one out? bacteria virus fungus B2 past EXAM questions! • I will be round to mark them as you go ready to put into your progress folder. ALL must do 2 exam questions SOME will do more so can pick their highest grade for progress folder FEW will do all exam questions for a PRIZE! Exam Question (hard) 3 marks – pick from the following • number of bacteria after 2 hours is 12 800 (or 1.28 x 104), which is a sufficient number to cause food poisoning • idea that if conditions were not optimum the actual number may be lower than this • idea that not enough data/evidence/information, or would need to measure more things, to conclude that person will definitely get food poisoning • idea of immune response against bacteria or toxins / acid in stomach destroying bacteria or toxins Testing Urine • Draw the following table in your books neatly. Sample Protein Sugar A B C • Test the 3 urine samples for protein and for sugar using the equipment available. • EXTENSION: explain in as much detail as possible what homeostasis is and how water content is controlled in the Drug Trials • Outcomes: create a Powerpoint on the use of drug trials in medical science. Include information on the following: - Laboratory testing on human cells [C] - Laboratory testing on animals [C-B] - Human clinical trials [A] - ‘blind trails’ (you’ll need to know what a placebo is) - ‘double blind trials’ Starter – Describe what this image below shows An antibody can only bind to a specific type of antigen Exam Question (hard) 3 marks – pick from the following • number of bacteria after 2 hours is 12 800 (or 1.28 x 104), which is a sufficient number to cause food poisoning • idea that if conditions were not optimum the actual number may be lower than this • idea that not enough data/evidence/information, or would need to measure more things, to conclude that person will definitely get food poisoning • idea of immune response against bacteria or toxins / acid in stomach destroying bacteria or toxins Describe the peer review process and explain why it is important • Scientists in the same field check the validity of research • Work is only published if it is found to be trustworthy /reliable • Important because only trustworthy/reliable science is published • Information will not mislead the public How will alcohol in the beer affect the amount of ADH release into Damon’s bloodstream and how will this affect the volume of Damon’s urine? • Alcohol suppresses ADH production • Damon will have a greater volume of urine Why is there no vaccine for the HIV virus? • HIV does not have a protein coat so cannot be recognised by antibodies • HIV seeks out and actively attacks WBCs therefore weakening the immune response • HIV makes your own body start to destroy its own WBCs Arteries and Veins Artery thick layer of muscle and elastic fibres thick outer layer Vein thin outer wall thin layer of muscle and elastic fibres Arteries • These carry blood AWAY from the heart (Think Arteries Away = AA) • They are buried deep in the body • They carry oxygen rich blood (except for the pulmonary artery!) Veins • These carry blood IN to the heart • (Think veINs=IN) • They carry oxygen poor blood (except for the pulmonary vein!) Capillaries • These carry blood to the cells • They are narrow vessels running throughout the body • They carry oxygen rich blood from the arteries, past the cells. The oxygen poor blood is then carried to the veins. Can you label the blood vessels? 1. Artery, capillary, vein, 2. small lumen, large lumen, very small lumen 3. Single cell wall, thick elastic wall, thin wall Antibiotic Resistance Superbug Video 15 mins to make a postcard for a doctors surgery on antibiotic resistance Plenary - The Circulatory System Arteries Veins Capillaries Which of these blood vessels: 1. Takes blood away from the heart? 2. Carries oxygenated blood? 3. Contains blood under high pressure? 4. Is only 1 cell thick? 5. Contains valves? • Name an organism that has a cell wall • What is the advantage of having a cell wall? • If penicillin prevents bacteria forming peptide cross-linkages in cell walls, how does penicillin work? Starter- B2 lesson 3 Immunity Discuss with the person next to you. (at your discretion) • What is the worst illness you’ve ever had? • Have you ever been into hospital (apart from birth) • Have you taken medicine for an illness (what was it) • How did it work? Ways to fight diseases • Antibiotics • Read together pg 40 and 41 – summarise in your own words • Question 1 - 5 Vaccine • Draw diagrams from page 44 showing how a vaccine works SMALL POX – WHY VACCINATED AND ERADICATED Smallpox is a serious, contagious, and sometimes fatal infectious disease (30% of infected people died). There is no specific treatment for smallpox disease, and the only prevention is vaccination. The name smallpox is derived from the Latin word for “spotted” and refers to the raised bumps that appear on the face and body of an infected person. Smallpox Click What is the… What is the… BENEFIT • WS AB2_11 Is it worth it Flu Why can you catch this again? AIDS Why can you not fight this off? WS AB2_9 What if everyone did that Susan and June are both young mothers with babies. They are in the park watching their older children play. June: We’re taking little April for her MMR jab tomorrow. I hope she’ll be alright. Susan: You’re mad! Why are you even risking it? June: We’d rather risk her having a bad reaction to the jab than getting one of those diseases. Susan: But those old diseases have almost disappeared now. There’s hardly any chance of her getting one of them. June: But the diseases have only disappeared because people get their children vaccinated. Susan: Yes, but they have disappeared. So now there’s no need to worry. June: But if people don’t get their babies vaccinated the disease will come back. Susan: Yes, but that’s people, not you. There’ll always be plenty of goody-goodies who do what the doctors say. So why should you risk April’s health when you’ve no need to? June: Well, we’re not risking it very much. The doctor told us that the chances of her being badly affected, or affected at all, are very low indeed. Susan: Yes, but why take any risk at all? As long as other people are having their babies done, why take the chance? I’m certainly not going to risk my Danny. Susan thinks that it’s stupid to vaccinate your baby. There is a small risk of the baby being badly affected by the vaccine. She thinks that this is OK because enough other people are getting their babies vaccinated. So it’s unlikely that her baby will get the disease. Whooping cough • Rd pages 47 and 48 Cut and stick viewpoints Whiteboard quiz Whatcha know now eh?? 10 mins to finish a postcard for a doctors surgery for mums awaiting an MMR jab Which is riskier? Nuclear Power or Peanut Butter? How would you know? • When people talk about risk what do they say? Rank these in order of highest to lowest risk • • • • travelling in a plane cycling driving a car living near a nuclear power plant • living in Cornwall • living in a city • smoking Rank these in order of highest to lowest risk • • • • • • • • travelling in a plane cycling driving a car We’ll find out later living near a nuclear youpower were right! plant fall-out from a nuclear accident such as Chernobyl living in Cornwall living in a city smoking if An example about perception of risk… People are still very frightened about BSE as they did not volunteer to take a risk of catching disease when they bought the food. However, some people will volunteer to aid refugees in war. Who perceives that the risk is larger? Whether or not you volunteer for the risk affects your perception 3 other things that affect your perception… • Can you think of a risk that does not affect people or an area equally? • Can you think of a risk that results from a man-made rather than a natural source? • Can you think of a risk where there is a threat of death in some form? Some hints… • Can you think of a risk that does not affect people or an area equally? • Can you think of a risk that results from a man-made rather than a natural source? • Can you think of a risk where there is a threat of death in some form? Bird flu Mobile phone masts Climate change All these risks give an equal probability of increasing your chance of death by one part in a million: Activity Smoking just 14 cigarettes Travel 10 miles by bicycle Travel 1000 miles by jet plane Have 1 chest x-ray Drinking 30 cans of a diet drink Living for 2 days in a polluted city such as New York Living 150 years within 20 miles of a nuclear power plant Cause of death Cancer or heart disease Accident Accident Cancer Cancer (from saccharin) Air pollution Cancer Is this better? Activity Smoking 10 cigarettes a day Being 15% overweight Moderate alcohol consumption Working in agriculture Working in construction Working in a nuclear plant (10 mSv per year) Activity Expected reduction in lifespan 6 years 2 years 1 year 320 days 227 days 51 days Expected reduction in lifespan Is this better? Activity Smoking 10 cigarettes a day Being 15% overweight Moderate alcohol consumption Working in agriculture Working in construction Working in a nuclear plant (10 mSv per year) Activity Expected reduction in lifespan 6 years 2 years 1 year 320 days 227 days 51 days Expected reduction in lifespan Were you right? So what is risk? risk = probability x consequence risk = probability x consequence Apply this equation to bungee jumping risk = probability x consequence Apply this equation to driving a car risk = probability x consequence Apply this equation to having a swimming pool in your back garden and having small children risk = probability x consequence Apply this equation to getting out of bed in the morning X-rays… Are they safe? Another way of expressing risk… • In the 1980s the following research was published: – Women who take the contraceptive pill have a 50% increased risk of cervical cancer. Another way of expressing risk… • In the 1980s the following research was published: – Out of 100,000 women not on the pill 4 are likely to get cervical cancer. – Out of 100,000 women on the pill 6 are likely to get cervical cancer. – This is a increase of 50%. …. What do you think now? Arteries and veins Brainpop Coronary Arteries • How the heart itself lives?? • Bring oxygen and glucose to the heart muscles • Fatty lumps can block it and bring on a heart attack Video IB.2 As the atrium fills with blood, the valves are closed. When the atrium contracts and squeeze the blood, the valves are pushed open. These valves are connected to the side wall of the heart by tough tendons. These tendons allow the valves to close but not invert. valve tendon wall of ventricle These tendons can be compared to an arm holding onto the handle of a door. The arm bends as the door is opened. When the door is closed the arm is fully extended. It would be impossible for the door to open in the other direction without the person moving with it. The tendon (represented by the arm) is held in a fixed position and therefore the valve (door) can only open in one direction. The blood will naturally push against the valve. However, the valves remain firmly shut. In this way, the blood can be moved from chamber to chamber quite efficiently. The valves prevent the blood from moving in the wrong direction. we also find valves here ...and here! These extra valves stop the blood from re-entering the heart when it is pumped from the ventricles. When the blood knocks against the first heart valves, it makes a ‘lub’ like sound. When the blood knocks against the second set of heart valves, it makes a ‘dub’ like sound. artery ventricle The blood ‘slaps’ against the valve and then passes along the artery. valve These two sounds – lub and dub – are actually what we hear as our heartbeat. So our heartbeat is in fact the sound of the valves opening and closing. Heart disease • AB2.9 Video Cholesterol and the heart 1 min talk about healthy hearts Plenery HEART DISEASE (T or F) 1.Heart attacks are common in the UK 2.Only men have heart attacks. 3.Young people don’t have heart attacks. 4.Smoking increases your risk of heart attack. 5.Heart attacks happen when arteries to the heart are blocked. 6.Heart attacks are always fatal. 7.When you have a heart attack, some of your muscle dies. 8.Heart muscle dies when it doesn’t get oxygen. 9.Any fat in your diet is harmful. 10.Being overweight puts a strain on your heart. !!! BREAD IS DANGEROUS !!! Research on bread indicates that: 1. More than 98 percent of convicted felons are bread users. 2. Fully HALF of all children who grow up in bread-consuming households score below average on standardized tests. 3. In the 18th century, when virtually all bread was baked in the home, the average life expectancy was less than 50 years; infant mortality rates were unacceptably high; many women died in childbirth; and diseases such as typhoid, yellow fever, and influenza ravaged whole nations. 4. More than 90 percent of violent crimes are committed within 24 hours of eating bread. 5. Bread is made from a substance called "dough." It has been proven that as little as one pound of dough can be used to suffocate a mouse. The average American eats more bread than that in one month! 6. Primitive tribal societies that have no bread exhibit a low incidence of cancer, Alzheimer's, Parkinson's disease, and osteoporosis. 7. Bread has been proven to be addictive. Subjects deprived of bread and given only water to eat begged for bread after as little as two days. Videos Epidemiological studies 1. Describe the correlation between smoking and lung cancer. 2. Is one case of a smoker dying of lung cancer enough to prove a link? 3. How big was the study by Doll and Hill which gave more evidence that smoking caused lung cancer? 4. What was the final piece of the puzzle that confirmed smoking causes lung cancer? Page 58 • Read page and do Q 1-6 Starter - What are the 7 life processes ? (things that all living things do) Use MRS GREN to help you… 1. M = 2. R = 3. S = 4. 5. 6. 7. G= R= E= N= Life Process M Movement R R _ pr _ d _ _ t _ _n S S _ n _ it _ v _ _ _ What it Means M _ _ _ all or parts of themselves. Make m_re living th_ _ gs like themselves Se _ se and re _ c _ to things around them Life Process G G_ _ wt _ R Respiration E Excretion N N _ tr _t _ _ n What it Means Increase in cell n_ m _ _ r and/or s_ z _ . Use a chemical reaction to release e_ _ _ g _ from f _ _ d. Get rid of w_ _ t _ materials they make Need various substances to help them r _ p_ _ r and g _ _ _. • http://www.youtube.com/watch?v=UaYHR x9-v2M Introduction • The oldest preserved medical document is from Egypt. • It was written in 1570 and is 20 metres long. • Over 700 remedies are included. • Many diseases are described, including diabetes and arthritis. • There have always been medical experts. • In 1804 bloodletting was used to treat many illnesses. • This 18th century kit was used for drilling a hole into the patient’s skull. • This treatment was used for centuries before this. • But anaesthetics weren’t introduced until 1846. • This picture shows the first public operation with anaesthetic. • New technology has helped doctors make a better diagnosis. • For example, X-rays show bones. MRI scans give information about soft parts of the body. So do ultrasounds. • Now doctors can get a lot of information without having to go into the patient’s body. • Treatments have also changed as scientists have learnt more about how the body works. • There are many medical challenges still to overcome. • Perhaps one of the most difficult is how to give expensive treatment to everyone who needs it. Some very large microbes • You may have seen pictures of bugs living in your house before. These bugs although scary looking are much, much larger than what we will talk about Imaginary Animals? Bee mites. Coloured scanning electron micrograph (SEM) of bee mites on the body of a bee. These parasites feed by cutting into the surface membranes of the bee. In large numbers they can devastate colonies of bees. Dust mites. Coloured scanning electron micrograph (SEM) of two dust mites on fabric fibres. Millions of dust mites inhabit the home, feeding on shed skin cells. They mainly live in furniture, and are invisible to the naked eye due to their size. The excrement and dead bodies of these mites may cause allergic reactions in susceptible people. Magnification: x150 Follicle mites. Coloured scanning electron micrograph (SEM) of follicle or eyelash mites These harmless parasites infest hair follicles (holes in the skin which contain the roots of hairs) around the eyelids, nose and in the ear canals of humans. One follicle may contain up to 25 growing mites. They feed on oily secretions from the glands, as well as dead skin cells. Magnification: x180 at 6x7cm size. Lice. Two lice, Phthirus pubis, also known as crab lice, hanging from human hair. An adult louse and infant louse are seen. An infestation of P. pubis causes pediculosis, the symptoms of which are severe itching and a rash. The lice suck blood, feeding five times a day. Each of the louse's six legs terminates in a massive claw, which folds inward to meet a thumb-like projection on the opposite side. The louse climbs & swings through its habitat, locking into position when disturbed. Magnification: x20 at 6x7cm size. Head louse and egg. Coloured scanning electron micrograph (SEM) of a human head louse (Pediculus humanus capitis) and an egg attached to a strand of human hair. The louse ranges in size from 2 to 3 millimetres in length. Each of its six legs end in a claw. Adult lice live for approximately 30 days, and during this time a female may lay 100 eggs (nits), which are glued to the bottom of hair shafts. An infestation of lice causes itching due to an allergic reaction to louse saliva. Bed bug. Coloured scanning electron micrograph (SEM) of 2 parasitic bed bugs, on fabric. The head has a pair of eyes (red), two antennae, and piercing mouthparts. A regular diet of blood is necessary for bed bugs to reach maturity. A parasite of humans, this species feeds at night and after a blood meal the body becomes quite swollen. The bite of a bed bug produces swellings on the skin. It is painful and may be lasting in some cases. During the day the bed bug lives in mattresses, floors, or in tears in furniture. Magnification: x10 at 6x7cm size. Dog tick, seen from the front. This blood- sucking parasite of dogs can transmit to humans a bacteria which causes spotted fever or tick fever, a form of typhus. The tick's specialised mouthparts are adapted to pierce the skin of the host. It has a flattened body which swells after a meal. Magnification: x22 at 5x7cm size. Feeding tick. Coloured scanning electron micrograph of a tick feeding head-down in human skin. Ticks are arachnids which parasitise mammals, birds and reptiles, feeding on their blood. In the feeding process, they cut through the skin with the scissorlike action of their modified mouthparts, and thrust their hypostome (feeding tool) through the lacerated skin, and lock into the surrounding tissues. Ticks can transmit diseases such as relapsing fever and Lyme disease, and their bites may become infected. Magnification: x30 at 6x7cm size. Deer tick. Coloured scanning electron micrograph of a deer tick. This is a bloodsucking parasite of animals and humans. Its sensory pedipalps (lower left) are seen shielding its specialised mouthparts, which are used to pierce the host's skin. Hairs on the pedipalps locate the host by detecting air-borne vibrations. Magnification: x27 at 6x7cm size. • Even smaller….. • So what is Bacteria??? Bacteria is a single cell organism about 100 times smaller than a human cell. Bacteria can reproduce outside of a human and are used to create cheese. They can also cause the food poisoning and tooth decay. Bacteria Chicken skin infected with bacteria Bacteria found in water Bacteria on human skin • So what is a Virus??? A virus is another microbe. It is about 100 000 smaller than a human cell. A virus needs another cell (a host cell) in order to reproduce. Viruses are responsible for causing HIV, common cold and chickenpox. 8C Even smaller! Fungus Fungi are another form of microbe. There are many different varieties ranging from bread mould to mushrooms. Yeast is a type of fungus that we use everyday to make bread penicillin fungus - yeast