Across
- 3. two organs of respiration
- 5. waste product delivered to the alveoli for exhalation
- 7. gas exchanged between capillary and alveoli, making the blood "red"
- 9. flap of cartilage that covers the voice box when swallowing
- 10. main muscle of breathing
- 12. windpipe
Down
- 1. microscopic structures in lung where gas is exchanged
- 2. extensions off of the trachea that carry air into the lungs
- 4. voice box
- 6. to breathe in
- 8. to breathe out
- 11. throat