Across
- 2. – The throat; passageway for both air and food.
- 5. – Element in the gas that is exhaled as a waste product.
- 8. – Double-layered membrane surrounding each lung.
- 9. – The act of pushing air out of the lungs.
- 13. – Flap that covers the trachea during swallowing.
- 16. – Structure containing the vocal cords; the “voice box.”
- 18. – Protein in red blood cells that carries oxygen.
- 19. – Tiny hairlike structures that move mucus out of the airways.
- 20. – The act of taking air into the lungs.
Down
- 1. – The “windpipe” that connects the larynx to the bronchi.
- 3. – Microscopic blood vessels where gas exchange occurs with alveoli.
- 4. – The two main airways that branch from the trachea into the lungs.
- 6. – The overall process of gas exchange in the body.
- 7. – The mechanical process of moving air in and out of the lungs.
- 10. – Gas inhaled and transported by red blood cells to tissues.
- 11. – Pair of organs responsible for breathing.
- 12. – The movement of gases from high to low concentration in the lungs.
- 14. – Dome-shaped muscle that contracts during inhalation.
- 15. – Smaller airways branching off from the bronchi.
- 17. – Tiny air sacs in the lungs where gas exchange occurs.