Across
- 4. Nerve cells that send messages all over your body to allow you to do everything.
- 6. A fibrous connective tissue that attaches muscle to bone.
- 7. Largest joint in a human body.
- 9. Carry blood back to the heart.
- 11. Main nerve tissue column that is connected to the brain.
- 13. Largest organ in the body and covers the body's entire external surface.
- 16. Long tube-like organ that connects the stomach and the large intestine.
- 19. Help you move, breathe, swallow and stay alive.
- 20. Controls all body functions of a human being.
Down
- 1. Carry blood away from the heart.
- 2. Contains the endocrine and exocrine gland.
- 3. Hormone that stimulates the secretion of milk by the mammary glands.
- 5. A collection of parts able to work together to serve a common purpose.
- 7. Two bean-shaped organs that filter your blood.
- 8. Material organism of an individual, human or animal, either living or dead.
- 10. Hardest tissue in the human body.
- 12. Biggest internal organ in the human body.
- 14. Principal muscle of respiration.
- 15. Basic structural and functional unit of all forms of life.
- 17. Lightest organ of the human body system.
- 18. An enclosed, cable-like bundle of nerve fibers.