Across
- 4. tubes leading from the trachea to inside the lungs
- 5. process in alveoli, where the air exchanges carbon dioxide and oxygen with blood through diffusion
- 6. houses the vocal cords
- 7. moistens tissue and filters air
- 9. also known as throat first place air enters through the nose and mouth
Down
- 1. sacs where air ends up, exchanging oxygen with the blood
- 2. small tubes leading into the alveoli
- 3. main muscle of respiration that causes lungs to expand and contract
- 8. hair-like structure protecting bronchi