The Respiratory System

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Across
  1. 2. also known as the voice box
  2. 4. smallest branches of bronchi found within the lungs
  3. 8. relating to the lungs
  4. 11. a series of paired bones protecting the thoracic cavity and its organs
  5. 12. blood vessels carrying deoxygenated blood back to the heart
  6. 14. blood vessels carrying oxygenated blood away from the heart
  7. 15. movement of air out of the lungs
  8. 17. air-filled cavities within a bone
  9. 18. the muscle that contracts and relaxes to increase and decrease the volume of the thoracic cavity
Down
  1. 1. movement of taking air into the lungs
  2. 3. site of gas exchange between the lungs and bloodstream
  3. 5. microscopic vessels connecting the arterial and venous systems
  4. 6. paired organs of the respiratory system
  5. 7. also known as the windpipe
  6. 9. elastic cartilage that covers the larynx to prevent food from entering the lungs
  7. 10. major entrance and exit for the respiratory system
  8. 13. large airways branching from the trachea to the lungs
  9. 16. also known as the throat