Respiratory System

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