1. IMMUNITY

2. There are three “lines of defense” within your body that serve to keep you healthy………

3. “Keep pathogens out of the body tissues in the first place!”
1st Line of Defense
Motto:
“Keep pathogens out of the body tissues in the first place!”
Skin
Tears
Hair
Mucus membranes
Saliva
Stomach acid
Earwax

4. “Pathogens have invaded body tissues. Destroy them non-specifically”
2nd Line of Defense
Motto:
“Pathogens have invaded body tissues.
Destroy them non-specifically”
Histamines are released
causes blood to rush to infection site
swelling, warmth, redness
“inflammatory response”
WBC’s engulf pathogens
pus?
Antihistamines

5. 3rd Line of Defense Motto: - The Immune System -
“The 2nd line of defense has failed. Resort to killing the pathogens specifically with chemical warfare.”
White blood cells concoct chemicals called antibodies that kill pathogens specifically
White blood cells “remember” how to make those antibodies for the future
antibody

6. Why is it that people tend to get illnesses like Hand-Foot & Mouth Disease once, and then never again?
Primary immune response
Occurs when a specific pathogen enters your body for the first time
It takes several days for WBC’s to figure out how to concoct the antibodies to destroy it
In the meantime, you get sick
Secondary Immune Response
Occurs when that same pathogen enters your body again in the future
WBC’s remember that pathogen and how to concoct the antibody. They do so QUICKLY, before it has the chance to make you sick

7. SLOW antibody production pathogen has opportunity to reproduce
YOU GET SICK
FAST antibody production
pathogen has no opportunity to reproduce
YOU DON’T GET SICK

8. Made possible by memory cells. -- permanent immunity --
Active Immunity
Occurs when your own white blood cells learn and remember how to make the necessary antibodies that kill a pathogen, keeping you immune for your whole life.
Made possible by memory cells.
-- permanent immunity --
Examples:
having hand, foot & mouth disease
once, then never again
immunity after a vaccination

9. Passive Immunity -- temporary immunity --
Occurs when you receive the antibodies of immunity from somebody else
-- temporary immunity --
Examples:
being immune to a pathogen for a few months after receiving a blood transfusion
fetus developing inside its mother
baby for 6 months after birth
breastfeeding baby

11. There are three “lines of defense” within your body that serve to keep you healthy………
1st Line of Defense
Motto:
2nd Line of Defense
Motto:
3rd Line of Defense: The Immune System
Motto:
antibody

12. Active Immunity
Passive Immunity