Across
- 4. Air passes through the ........
- 6. The delivery of oxygen from the lungs into the bloodstream and the removal on carbon dioxide from the tissues
- 9. The smaller branches
- 10. The tiny sacs were Gas Exchange takes place
- 11. The two braches air passes through into the lungs
Down
- 1. The primary muscle used
- 2. The main organ
- 3. Goes into the body
- 5. a waste product that is created in the muscles when we exercise.
- 7. covers the larynx while swallowing
- 8. The type of protein found in every red blood cell