Across
- 3. Muscular organ that pumps blood
- 4. Shin bone (largest of the lower leg bones)
- 9. dioxide The waste gas we breathe out
- 10. Kneecap
- 11. The main organs for breathing
- 12. To take air into your lungs
- 14. Flap of tissue that prevents backward blood flow
- 15. Thigh bone(largest bone in the human body)
Down
- 1. Lower chambers of the heart
- 2. Upper chambers of the heart
- 5. Measure of your heartbeat
- 6. The gas our body needs to live
- 7. To let air out of your lungs
- 8. Collar bone
- 13. Upper arm bone (funny bone)