Across
- 1. the bony structure of the head
- 4. small veins
- 5. the brain and the spinal cord
- 8. egg-producing organs
- 9. the ankle bones
- 10. sac on underside of the liver
- 13. the breastbone
- 15. voice box
- 16. moving gases between the cells and the blood
- 18. the male organs of reproduction
- 19. the outer layer of the skin
Down
- 1. the shoulder blade
- 2. any blood vessel that returns blood to the heart
- 3. used as a reservoir for urine
- 6. nose bones
- 7. when the left ventricle contracts
- 11. vessel that carries blood away from heart
- 12. the upper arm bone
- 14. the medial bone of the forearm
- 17. inner layer of skin