Across
- 2. Organs where gas exchange occurs during breathing.
- 5. Tiny air sacs where oxygen and carbon dioxide are exchanged.
- 7. A passageway for air that connects the nose to the larynx.
- 9. The process of breathing air into the lungs.
- 10. Two main tubes that branch from the trachea into each lung.
- 11. The swapping of oxygen and carbon dioxide in the lungs.
- 12. A waste gas produced by cells and exhaled.
Down
- 1. Small air passages in the lungs that branch off the bronchi.
- 2. The voice box that keeps the airway open.
- 3. The process of breathing air out of the lungs.
- 4. The space where air is filtered, warmed, and moistened.
- 6. The windpipe that carries air from the throat to the bronchi.
- 8. A muscle below the lungs that helps with breathing.
- 13. A gas needed by cells for cellular respiration.
- 14. Movement of gases from high to low concentration.