Respiratory System
Across
- 2. Bones that protect the lungs
- 5. Tiny air sacs where the lungs and the blood exchange oxygen and carbon dioxide
- 6. Main organ in the respiratory system
- 8. Also known as "the windpipe."
Down
- 1. Muscle that helps people breathe
- 3. Tubes that go into the lungs
- 4. Hairs in the nose that clean the air coming in
- 7. The voice box that helps people speak