Across
- 4. System that breaks down food into nutrients
- 5. System that returns fluid to the bloodstream and fights infection
- 7. System that provides structure and protects organs
- 9. System involved in producing offspring
- 10. A single cell that sends electrical signals
- 11. System involving the heart and blood vessels
- 12. System that protects the body from pathogens
- 13. System that removes waste from the blood
Down
- 1. Organ responsible for taking in oxygen and expelling carbon dioxide
- 2. System that transports blood, nutrients, and oxygen throughout the body
- 3. System that produces hormones to regulate the body
- 6. System that allows movement through contraction
- 8. System that includes skin, hair, and nails
- 9. System responsible for breathing and gas exchange
- 10. System that controls thoughts, movement, and sensation