Across
- 2. keep blood from flowing backwards in the heart
- 3. white blood cell that "eats" invaders
- 6. system which protects against pathogens
- 7. small bone embedded in muscle
- 10. kind of immunity a baby gets in the womb
- 11. system which takes in oxygen
- 13. produces long-term immunity
- 15. kind of immunity one gets through vaccination
- 16. type of bone found in the vertebrae and tailbone
- 17. first line of defense against pathogens
Down
- 1. gets rid of wastes and cools the body
- 4. system which includes the heart
- 5. nerve cell that supports and nourishes neurons
- 8. system which takes in and processes nutrients
- 9. large white cells which are first to respond
- 12. system which gets rid of body wastes
- 14. causes lymphocytes to be produced