Organ Systems

4. Breaks down food
7. long tube-like band of tissue that connects to your brain
8. Delivers nutrients and oxygen to the cells
10. Move fresh air into your body while removing waste gases
11. Maintains fluid levels in our body tissues
12. secretes acid and enzymes that digest food
16. makes hormones that control the rate of many activities in your body
17. striated muscle that constituted the main tissue of the wall of the heart
19. outer covering of the body
20. air-filled organs located on either side of the chest
21. pieces making up the skeleton in bodies
22. protects your body from infection and injuries you could get from your external environment

1. Responsible for movement
2. maintain the volume and composition of body fluids within normal limits
3. regulates most chemical levels in the blood
5. Made up of the body's different hormones
6. Produce egg and sperm
9. filters and stores blood and produces white blood cells that fight infection or disease
13. female reproductive organ in which eggs are produced
14. Transmits signals between the brain and the rest of the body
15. organ that pumps blood throughout the body
18. Support structure for the body