Across
- 2. two narrow tube that carry air into the lungs from the trachea
- 4. a vessel that carries blood away from the heart (O2)
- 5. a vessel that carries blood toward the heart (Co2)
- 6. a tiny blood vessel
- 7. a large muscle below the lungs
- 9. the lower two chambers of the heart
- 10. the main organs of the respiratory system
Down
- 1. the upper two chambers of the heart
- 3. a system that transport blood and other fluids in open space that surround organ in the body
- 8. miscroscopic sacs at the end of the bronchioles where gas exchange occurs