Across
- 5. Waste gas released from the blood into the air sacs
- 7. Muscle that contracts and flattens to draw air into the lungs
- 10. Ring-shaped cartilage pieces that support the trachea
Down
- 1. Thin walls surrounding alveoli and capillaries, allowing gas diffusion
- 2. The tubes that branch off the trachea and lead to the lungs
- 3. The main passageway for air between the larynx and bronchi
- 4. Tiny hairs in the nose and trachea that trap dust and particles
- 6. The chamber formed by the ribs, sternum, and spine, protecting the lungs
- 8. Tiny air sacs in the lungs where gas exchange happens
- 9. Structure at the top of the trachea that vibrates to produce sound