Respiratory system

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Across
  1. 2. A substance in the lungs that lowers surface tension and prevents alveolar collapse.
  2. 5. The microscopic air sacs in the lungs where gas exchange occurs.
  3. 6. The structures in the larynx that vibrate to produce sound for speech.
  4. 8. The dome-shaped muscle that facilitates breathing.
  5. 9. The smallest airways that lead to the alveoli.
Down
  1. 1. The gas expelled from the body during exhalation.
  2. 3. The phase of breathing when air is expelled from the lungs.
  3. 4. The process by which cells use oxygen to generate energy.
  4. 5. The structures in the lungs that allow airflow to the alveoli.
  5. 7. The phase of breathing when air is drawn into the lungs.