Across
- 5. White blood cell
- 6. Chemical molecules which travel through the blood to affect body systems
- 7. Oil glands
- 8. Composed of the skin, hair, and glands associated with the skin
- 9. Weakened or killed antigen which when injected promotes immunity
Down
- 1. Foreign particle in the body
- 2. Control of the body temperature
- 3. Secrete into body cavities or onto surfaces through ducts
- 4. System which protects the body from infection