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