Across
- 4. Bones of the fingers and toes
- 9. Location of red blood cell formation
- 11. Narrowing of the arteries
- 13. Organs that filter the blood
- 15. Carry oxygen in the blood
- 17. Prevent backwards flow of blood in the heart
- 18. Small gas-filled sacs in the lungs
- 20. Pumps blood to the left ventricle
- 21. Muscle that squeezes the hollow organs of the body
Down
- 1. Divides the heart into right and left sides
- 2. The breastbone
- 3. Muscle found in the heart
- 5. Where gas exchange occurs between blood and body tissues
- 6. Muscle type under voluntary control
- 7. Carries blood to the lungs
- 8. Produces speech sounds
- 10. Connect muscle to bone
- 12. Organ that removes and breaks down toxins from the blood
- 14. Muscle that extends the knee
- 16. Connect bone to bone
- 19. The kneecap