Across
- 4. carries oxygen to the muscles
- 5. contracts downward to lift up the ribcage
- 8. space in between the chambers of the heart
- 11. membrane that covers each lung
- 12. performance enhancing substance
- 13. air left in the lungs after exhalation
- 15. the number of breaths per minute
- 16. inhaling air
Down
- 1. amount of oxygen used in 1 minute
- 2. number of heart beats per minute
- 3. arteries, capillaries and veins
- 6. system that sustains correct internal temp
- 7. exhaling air
- 9. exchanges gas through capillaries
- 10. carry's deoxygenated blood to the heart
- 14. amount of blood pumped by the heart permin