Biology

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Across
  1. 3. small bags where gas exchange takes place
  2. 4. not breathing
  3. 7. chest cavity
  4. 9. synonym of ventilation
  5. 12. breathing in
  6. 13. breathing out
  7. 15. the body's food pipe
Down
  1. 1. below the lungs large muscle sheet
  2. 2. name of the system responsable for breathing
  3. 5. process in which air moves in and out
  4. 6. gas you need for respiration
  5. 8. what protects the lungs
  6. 10. the blood pumping organ
  7. 11. tiny hairs that help remove dirt and microorganisms
  8. 14. organ that works like baloons in your body