d

Edit Answers
123456789101112131415
Across
  1. 9. The centers in the brainstem that control the rhythm of breathing
  2. 11. The air sacs in the lungs where gas exchange occurs
  3. 13. The substance that reduces surface tension in the lungs
  4. 14. The pressure exerted by a particular gas in a mixture of gases
  5. 15. The space behind the nose where air enters the respiratory system
Down
  1. 1. The system responsible for breathing and gas exchange
  2. 2. The main organ of the respiratory system
  3. 3. The passage connecting the nose and mouth to the esophagus and trachea
  4. 4. Tree The network of tubes that carry air to and from the lungs
  5. 5. The maximum amount of air that can be exhaled after a deep breath
  6. 6. The smaller branches of the bronchial tree
  7. 7. The windpipe
  8. 8. The thin layer where gas exchange occurs in the lungs
  9. 10. The main air passages in the lungs
  10. 12. voice box