The Respiratory System

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Across
  1. 4. bone structure which protects the heart and lungs
  2. 5. tiny hairs which move in wavelike motion to remove dust and dirt
  3. 7. taking air into the lungs
  4. 9. muscle located under the lungs
  5. 13. letting air out of the lungs
Down
  1. 1. covered in cartilage for protection
  2. 2. tube which leads from trachea to each lung
  3. 3. membrane that allows the lungs to move easily during ventilation
  4. 6. main organ of the respiratory system
  5. 8. also known as the voice box
  6. 10. tiny sacs within the lungs where gas exchange occurs
  7. 11. a substance that warms and moistens the air as well as traps foreign substances
  8. 12. located at the back of the nose and mouth. Carries both food and air