Immunity

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Immunity
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What do you see?   What is happening? Compare
the picture on the right to picture on the
left.  
What is going on? Does it look like something
good or bad that is happening?
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How Body Defends Itself

• 2 Lines of Defense
• 1. First Line of Defense - General
• 2. Second Line of Defense - Specific

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Skin

• Barrier
• Protects pathogens from entering body
• How could pathogens get in?
• Cut
• Mouth
• Nose/eys
• Defense mechanism
• Surface area

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Respiratory System

• Traps pathogens w/ cilia mucus
• Mucus has enzymes that weaken cell walls
• What do you do daily that could get rid of
  pathogens trapped?

COUGH/ SNEEZE
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Digestive System

• Saliva- kills bacteria
• Enzymes- in stomach, pancreas, live
• Hydrochloric acid- digest food
• Mucus-
• found on walls
• Coats bacteria
• Prevents from binding to inner linings of organs

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White Blood Cells

• What do we know about WBC?
• In circulatory system
• Surrounds and digests foreign objects
• Like police/body guards
• Patrol body
• Look for invaders
• Sweet them out and digest them

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Antigens

• Foreign Bodies
• What body is fighting against
• Either separate molecules or found on pathogens

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Note

• Antibodies proteins made in response to
  specific antigens
• Attaches to antigen and makes it useless

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T-Cells! HURRAY!!!!!

• Lymphocytes that respond to foreign molecules

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Killer T-Cell

• Release enzymes that destroy invading matter

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Helper T-Cell
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B-Cells

• Lymphocyte
• Has antibodies for specific pathogens
• Stay in blood ready to defend again if they enter
  body another time.

                                      
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Active/Passive Immunity

• How your body helps to defend itself
• ACTIVE
• Body makes antibodies to antigens
• PASSIVE
• Antibodies are introduced to your body from
  another animal.
• Doesnt last as long

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Vaccination

• Why do we need to get vaccinated???
• Process of giving a vaccine via mouth or
  injection
• Prevent a disease
• Not a cure
• Babies need to develop their immunity

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