Immune System

5. Destroy cells that have been infected by the invader
9. This type of immunity is given to us when we are born or from another person or animal. It is not an immunity made within our own body.
10. Tell B cells to start making antibodies or instruct killer T cells to attack
11. Introduce microbes that are already killed or modified so we don't get sick but our body can recognize the sickness
13. An organ in your belly that filters blood and helps fight infections. Where leukocytes can be found
15. Also called T lymphocytes, they get rid of good cells that have already been affected
16. This word means "to be protected". This body system helps protect us against diseases.
17. Also called B lymphocytes, they produce antibodies that bind to antigens and stop them from making us sick
19. The proteins that fight off antigens
20. An example of a tiny invader that can make us sick
21. Tiny invaders that make us sick (examples are such as viruses, bacteria, and parasites)

1. Chew up invading germs
2. Remember antigens that have already attacked the body, helping the body to fight off any new attacks by a specific antigen
3. An example of a tiny invader that can make us sick
4. An example of a tiny invader that can make us sick
6. Where T Cells and B Cells are stored in the body
7. Allow the body to remember and recognize previous invaders
8. This type of immunity develops over time. When we are exposed to a disease (and sometimes get sick), the immune system learns how to fight off the disease so it knows what to do if the sickness comes back.
12. The invaders that can cause disease
14. Another name for white blood cells
18. A thick, spongy jelly inside your bones where leukocytes can be found