Across
- 5. Also known as the windpipe
- 6. Gas formed during respiration
- 7. Organs that transfer oxygen into the blood
- 9. Air sacs.
- 11. Flap that prevents food or drink from entering the respiratory system
Down
- 1. Delivers air to the gas exchanging units
- 2. The throat
- 3. Conducts oxygen into the lungs
- 4. Tiny blood vessels that distribute oxygen to cells
- 8. The nose
- 10. Gas that is required for someone to live.