respiratory systems

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Across
  1. 2. Organs where gas exchange occurs during breathing.
  2. 5. Tiny air sacs where oxygen and carbon dioxide are exchanged.
  3. 7. A passageway for air that connects the nose to the larynx.
  4. 9. The process of breathing air into the lungs.
  5. 10. Two main tubes that branch from the trachea into each lung.
  6. 11. The swapping of oxygen and carbon dioxide in the lungs.
  7. 12. A waste gas produced by cells and exhaled.
Down
  1. 1. Small air passages in the lungs that branch off the bronchi.
  2. 2. The voice box that keeps the airway open.
  3. 3. The process of breathing air out of the lungs.
  4. 4. The space where air is filtered, warmed, and moistened.
  5. 6. The windpipe that carries air from the throat to the bronchi.
  6. 8. A muscle below the lungs that helps with breathing.
  7. 13. A gas needed by cells for cellular respiration.
  8. 14. Movement of gases from high to low concentration.