Respiratory System
Across
- 5. Branching air passages inside the lungs
- 6. Leading cause of cancer death for both men and women
- 8. Air flow out of the lungs
- 9. Microscopic air sac of the lungs
- 10. Air flow into the lungs
- 12. Process that supplies the body with oxygen and rids carbon dioxide
Down
- 1. Secretion that reduced surface tension of water molecules; prevents collapse of alveoli
- 2. The windpipe
- 3. An increase in the rate and depth of breathing that exceeds the body's need to remove CO2
- 4. Occupy thoracic cavity
- 7. Breathing cessation
- 11. Air that remains in the lungs that does not contribute to gas exchange