1. The Immune System

2. Locking the Pathogens Out
The 5 Barriers:
Skin
Tears
Saliva
Mucous Membranes
Stomach Acid
How do these barriers keep Pathogens out?
Locking the Pathogens Out

3. When Pathogens invade the body, multiply, and harm some of your body cells.
Infection?

4. What is your immune system good for?
A combination of body defenses made up of cells, tissues, and organs that fight pathogens in the body.
What is your immune system good for?

5. Non-Specific Immune Response
Why is an immune response non-specific?
Non-Specific Immune Response

6. 1st step for Non-specific immune response: Inflammation
The body’s response to injury or disease.
Swelling, pain, and heat.
1st step for Non-specific immune response: Inflammation

7. 2nd step for Non-specific immune response: Fever
Higher body temperature makes it more difficult for pathogens to multiply
Increases the number of white blood cell production.
2nd step for Non-specific immune response: Fever

8. The Specific Immune Response
Lymphatic System- a second circulatory system
Helps move white blood cells around the body

9. B cells
T cells
NK cells
Lymphocytes

10. Antigens Attach to a pathogen
Body senses; reacts by producing more B and T cells
Antigens

11. Antibodies Made by B cells
Attach to Antigens faster reducing the rate of infection.
Programmed to fight a particular pathogen
Antibodies

12. Like antibodies respond quickly to a pathogen.
Memory B and T cells

13. Identify Pathogen and stimulate production of B cells.
Helper T cells

14. Attach to antigens and kill the pathogen.
Killer T cells

15. The ability to resist pathogens that you have previously come into contact with
Immunity

16. Immune Response

17. A dead or weakened pathogen introduced into the body to create an immune response
This response produces an immunity to that pathogens specific antigens.
Vaccines

18. Recommend Ages for vaccinations