Respiratory System
Across
- 3. site of gas exchange, small air sacs at the terminal end of the lung bronchioles
- 5. lid-like structure that covers windpipe during swallowing to prevent choking
- 7. small blood vessels in the lungs where carbon dioxide and oxygen exchange occurs
- 10. series of branching tubes in the lungs that transport air
- 11. large flat muscle connected to the ribs at the bottom of the thoracic cavity
- 12. throat
Down
- 1. fluid necessary for reduction of friction between the lungs and cavity
- 2. trachea divides in 2
- 4. movement of air into the airway
- 6. windpipe, rigid tube about 5 inches long surrounded by cartilaginous rings
- 8. voice box
- 9. take in oxygen, rid body of carbon dioxide