The Respiratory System

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Across
  1. 1. pumps oxygenated blood around the body
  2. 4. top of the airway that air passes through
  3. 5. gas taken into the blood when you inhale
  4. 8. tiny air sacs where gas exchange happens
  5. 10. bones that protect the lungs and heart
  6. 12. two main tubes that lead into each lung
  7. 13. Trachea has rings of these for strength and support
  8. 14. smaller air tubes that carry air to the alveoli
Down
  1. 2. breathing out to remove carbon dioxide
  2. 3. the windpipe that carries air to the lungs
  3. 6. muscle that helps you inhale and exhale
  4. 7. waste gas removed from the blood and exhaled
  5. 9. main organ of the respiratory system
  6. 11. breathing in to bring air to the alveoli