The respiratory system

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Across
  1. 2. The opening through which air enters the body
  2. 4. The tube that connects the throat to the bronchi
  3. 7. The muscle that contracts to allow breathing
  4. 9. Tiny hair-like structures that help move mucus out of the respiratory system
  5. 10. The organ that helps oxygen enter the bloodstream
Down
  1. 1. The physical process of inhaling and exhaling gases
  2. 3. Tubes that branch off from the trachea and lead to the lungs
  3. 5. The flap of tissue that prevents food from entering the airway
  4. 6. The structure in the throat that contains the vocal chords
  5. 8. This is where the air from mouth and nose meet