The (First Day Back) Plan…
2 April 2013
• Welcome back…
 We need to clear up some of those Spring Break cobwebs
• A few tasks to accomplish:
 Review Ch2 Test & Assessment
 Hopefully this goes “smoother”
 Mark Osmosis Jones Handout
• Quick Review of where we’re at
 3.1 – The Immune System
• Start 3.2 – Factors Affecting the Immune System
(c) McGraw Hill Ryerson 2007
3.1 Immune System Review
• Tell me what this is:
• Pathogen:
• Second Line also involves:
 B-Cells
 Produce
antibodies to
combat antigens
 Germs or disease-causing
invaders
• First Line of Defence:
 Skin & Linings of all internal body
systems (Examples?)

 T-Cells
 Helper: activates B cells
 Killer: kill antigens on their own
i.e. sweat and oil on skin, mucus and
cilia in nose & gastric juices in stomach
• Second Line of Defence:
 Includes “innate immune system”



Born with (Examples?)
Includes inflammation, white blood cells
Also “acquired immune response”

Battles antigen (body doesn’t
recognize)
• Active Immunity

Memory to combat future infection
• Questions?
(c) McGraw Hill Ryerson 2007
3.2 Factors Affecting the Immune System
• Vaccines are weakened versions of a
disease pathogen that are given to
people to protect them from getting
the disease later.
• Vaccines allow your body to create
antibodies against the disease.
• Boosters are needed for some
vaccines to extend the immune
system’s memory.
See pages 110 - 111
(c) McGraw Hill Ryerson 2007
Disorders of the Immune System
Allergies
• An allergy is an unusually high
sensitivity to some substance.
• Any substance that causes an allergic
reaction is called an allergen.
 Common allergens are: milk, pollen, and
dust.
• Body releases chemical called
histamine to fight allergen.
 Common symptoms include a runny nose
and watery eyes.
Dust Mite
• Severe allergies can cause an
anaphylactic shock.
See pages 112 - 113
(c) McGraw Hill Ryerson 2007
Disorders of the Immune System
AIDS – Acquired Immunodeficiency
Syndrome
• AIDS is caused by a virus called HIV
• HIV attacks the immune system by
infecting Helper T Cells.
 When other pathogens or antigens enter
the body the immune system can’t
activiate Killer T cells or B cells.
• AIDS is transmitted by blood and
semen.
Illustration of HIV
See pages 113 - 114
(c) McGraw Hill Ryerson 2007
Taking Care of Your Immune System
Important steps you can take to help your immune
system stay healthy.
See page 114
(c) McGraw Hill Ryerson 2007
Tomorrow and beyond…
• Tomorrow’s task:
 Review 3.2 Handout
 CYU P.117 # 2-12, 15-17
• Thursday:





Review CYU P.117
Chapter Review Day
Chapter Review in Text
Chapter Summary Sheets
Tie up lose ends:
 Vocab
 Missed Assignments etc. (Bill Nye…)
• Friday:
 Ch 3 Unit Test…
(c) McGraw Hill Ryerson 2007