Across
- 2. Phase when the heart contracts.
- 4. Where two bones meet.
- 6. Organs responsible for gas exchange in the body.
- 8. Basic structural and functional unit of life.
- 11. Muscle located in the upper arm.
- 12. Chemical messenger secreted by glands..
- 13. Part of a neuron that transmits impulses.
- 14. Central organ of the nervous system.
- 16. Organ that detoxifies chemicals and metabolizes drugs.
- 19. Protein that speeds up chemical reactions.
- 20. Connects muscle to bone.
- 21. Supports the body and houses the spinal cord.
Down
- 1. Blood vessel that carries oxygenated blood away from the heart.
- 2. Bone that protects the brain.
- 3. Tissue responsible for movement.
- 5. Basic unit of the nervous system.
- 7. Fluid component of blood.
- 9. Filters waste from the blood.
- 10. Organ that pumps blood throughout the body.
- 15. Involuntary response to a stimulus.
- 17. Blood vessel that carries blood back to the heart.
- 18. Transmits signals throughout the body.