Across
- 1. - Double-layered membrane that surrounds the lungs.
- 6. - Gas inhaled into the lungs and delivered to body tissues.
- 8. - Dome-shaped muscle that contracts during inhalation.
- 11. - Flap that prevents food from entering the trachea.
- 13. - Windpipe that connects the larynx to the bronchi.
- 15. - The pair of organs responsible for gas exchange with blood.
- 18. - Two main tubes that branch from the trachea into each lung.
- 20. - The act of drawing air into the lungs.
Down
- 2. - The voice box that houses the vocal cords.
- 3. - Smaller airways that branch off from the bronchi inside the lungs.
- 4. - The overall process of breathing and cellular gas exchange.
- 5. - Protein in red blood cells that binds and carries oxygen.
- 7. oblongata - Part of the brain that controls the rate of breathing.
- 9. - Tiny air sacs in the lungs where gas exchange occurs.
- 10. - The throat; passageway for both air and food.
- 12. volume - The amount of air inhaled or exhaled in a normal breath.
- 14. - The act of releasing air from the lungs.
- 16. exchange - Process of oxygen entering blood and carbon dioxide leaving it.
- 17. cavity - Space inside the nose that warms, moistens, and filters air.
- 19. dioxide - Waste gas transported from tissues to the lungs for exhalation.