Homeostasis

1. any disease-causing microorganism
6. large phagocytes
7. any substance that causes an immune response
8. the body's defense system against infectious organisms and other invaders
10. the maintenance of a stable, internal environment
12. a hormone produced in the pancreas that removes glucose from the blood and puts it into cells
13. immune cells created in the thymus gland that produce substances that attack infected cells in the body
15. "cell eating"
17. special proteins produced by the cells of the immune system that help destroy antigens
18. a type of white blood cell that ingests disease-causing organisms

2. a system of hormone-producing glands that produce hormones that regulate metabolism, growth and development
3. the immunity that results from the production of antibodies by the immune system in response to the presence of an antigen
4. the short-term immunity that results from the introduction of antibodies from another person or animal
5. a type of active immunity in which a person receives a vaccine
9. immune cells that produce antibodies
11. a regulatory mechanism in which a stimulus causes an opposite 'output' in order to maintain an ideal level of whatever is being regulated
14. "chemical messengers"
16. a protein that detects a signal molecule and performs a response