12/2 DAILY CATALYST PG. 57 DISEASES 1. Your good friend is sick. Since you are a Biology II expert, they come to you for help! Propose a way to determine if your friend has bacterial or viral infection. 2. Why are vaccines not a treatment for viral infections? 3. If a solution surrounding a cell has 45% sugar, and the cell has 23% sugar, where will the water move? Why? 12/2 DAILY CATALYST PG. 57 DISEASES 1. Your good friend is sick. Since you are a Biology II expert, they come to you for help! Propose a way to determine if your friend has bacterial or viral infection. Give your friend an antibiotic, look at their cells under a microscope, and look at their symptoms. 2. Why are vaccines not treatment for viral infections? Vaccines are used for prevention not treatment of a virus. Your immune system will need to fight the virus. 3. If a solution surrounding a cell has 45% sugar, and the cell has 23% sugar, where will the water move? 45% sugar 55% water 23% sugar 77% water Water will move OUT of the cell 12/2 CLASS BUSINESS PG. 57 DISEASES DNA test corrections due Friday, December 5th Systems quiz #13 on Friday Test key on the website See me for tutoring Public health campaign project due Friday, December 5th Sign up to for presentations this week Presentations Thursday and Friday, December 11th-12th Worth a test grade Updated calendar on the website WINTER JOKE Why don’t mountains get cold in the winter? • They wear snowcaps. 12/2 AGENDA PG. 57 DISEASES Daily Catalyst Class Business Diseases Notes Homeostasis notes Practice Time 12/2 OBJECTIVE Describe causes, symptoms, treatments, and preventions of major communicable and noncommunicable diseases. KEY POINT #1 Key Point #1: Disease Any medical or physical condition that does not allow the body to function normally COMMUNICABLE VS NON-COMMUNICABLE Diseases can be grouped into two major categories based on their causes: 1. The kind that can be spread from one person or object to another person 2. The kind that cannot be spread Causes of Death Worldwide % of Worldwide Deaths Communicable Diseases (1) 30 Non-communicable Diseases (2) 60 Injuries 10 COMMUNICABLE VS NON-COMMUNICABLE Key Point #2: Communicable A disease that is infectious (can be spread from person, object, or animal to another person). **DO NOT BE FOOLED!** Infectious does not mean contagious! Infectious: Can be spread from one living cell to another Contagious: spread from person to person to person etc. Example of infectious diseases that are not contagious: -Tetanus HOW EXACTLY IS A COMMUNICABLE DISEASE SPREAD? Key 1. 2. 3. Point #3: Spread by Physical Contact: Person – to - person Person – to – object Through the air Contaminated Food and Water Infected Animals EXAMPLES OF COMMUNICABLE DISEASES Key Point #4: Examples Common cold Flu All STI’s Mono Chicken pox Malaria Ringworm Food poisoning OUT OF CURIOSITY…ARE THESES CONTAGIOUS? Common cold Flu All STDs/STIs Mono Chicken pox Malaria Ringworm Food poisoning OKAY, SO THEN WHAT IS NON-COMMUNICABLE? Key Point #5: Non- Communicable Any disease that is caused by genetic or lifestyle factors. Not infectious. So why exactly is it not communicable? You cannot get the disease from someone else (unless you are talking about a baby from their parents) because non-communicable diseases are NOT caused by pathogens HOW EXACTLY IS A NON- COMMUNICABLE DISEASE SPREAD? • • Key Point #6: Spread by – Genetics Lifestyle factors (lack of exercise and poor diet) EXAMPLES OF NON-COMMUNICABLE DISEASES Key Point #7: Examples Sickle cell anemia Diabetes Cancer Asthma Heart problems Allergies THUMBS UP OR THUMBS DOWN? Non-communicable diseases can be caused by bacteria THUMBS DOWN THUMBS UP OR THUMBS DOWN? If you catch a disease by touching an infected person, you have a communicable disease. THUMBS UP! THUMBS UP OR THUMBS DOWN? It is impossible to be born with a non-communicable disease THUMBS DOWN BREAK TIME Stand up and find a member of the class who has a different eye color than you. Take one minute to discuss your Fall Break and the amazing things you did for Fall Break. 12/2 OBJECTIVE PG. 58 HOMEOSTASIS Explain how body systems maintain homeostasis BODY SYSTEMS! MAINTAINING HOMEOSTASIS IN THE HUMAN BODY! EXAMPLES OF HOMEOSTASIS… Good blood sugar Reacting to a hot stove Good body fluid level Sweating to maintain temp. Ability to reproduce Urinating to maintain pH KEY POINT #1: HOMEOSTASIS Maintaining a stable internal environment Homeostasis same For example: Temperature regulation Reproduction Blood sugar control Fluid regulation pH Reactions still What happens when our body looks like this? KEY POINT #2: The control center: The brain detects changes and works to “fix” the changes LET’S TAKE IT A STEP FURTHER… How does a thermostat work? A sensor in the thermostat continuously measures the air temperature. A control mechanism then compares the current room temperature to a set point, say 70 degrees Fahrenheit. When the temperature falls below 70 degrees, the thermostat sends a message that turns on the furnace (heat). When the room temperature is above 70 degrees, the furnace will turn off may kick on the AC. WHAT THIS LOOKS LIKE… How does our body get back to this? KEY POINT #3: Negative feedback loops: communication loop between the body and the brain. KEY POINT #3: Negative Feedback Loops: How they work Counteract any changes in the human body that move conditions above or below a certain set point. ***Negative feedback loops help keep the internal environment stable*** NEGATIVE FEEDBACK LOOP IN THE HUMAN BODY… This is the reason why you cannot hold your breathe for a long time. As you hold your breath, sensors in the circulatory and respiratory system send information to the BRAIN. The brain detects high levels of CO2 and low levels of O2. This is not right! The brain signals your LUNGS and diaphragm to relax and take in a lot of oxygen. You continue to breathe until the O2 levels return to normal. HOW YOU MIGHT BE TESTED ON THIS… Reptiles regulate their body temperature by changing their environment. A snake for instance, must lie in sunlight to warm its body. Mammals, on the other hand, can regulate their internal environment to gain or lose heat. How might this ability give mammals an advantage over reptiles? KEY POINT #4: Thermoregulation: the process of the body maintaining its internal temperature. KEY POINT #5: Endothermic: organism can regulate its own body temperature Mammals Energy expensive Benefits? Exothermic: organism relies on the environment to regulate their body temperature Reptiles and fish Energy inexpensive Downside? WHY THIS MATTER? TURN AND TALK Why do homeostasis and feedback loops matter to us? It matters because our body is very delicate and needs to be kept at certain levels! Any change can cause death. WORK TIME Directions: Using your notes, complete the pathogen and disease worksheet in your Systems Packet. Do not lose this packet and I will check your completed worksheet tomorrow. Time: 12 minutes Noise: 1 (with partner) EXIT TICKET #13 Name: _________________ Period: ___ Date: 12/2 1. Write down one concept from yesterday or today that has stuck with you. 2. Write down one question you still have about pathogens, diseases or homeostasis.