The Respiratory System

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Across
  1. 3. Primary organ of gas exchange
  2. 5. Flap that prevents food from entering the airway
  3. 8. Branches of the airway leading into each lung
  4. 9. Membrane that surrounds and protects the lungs
  5. 10. Contains the vocal cords; also called the voice box
Down
  1. 1. Smallest air passages before the alveoli
  2. 2. Tiny air sacs where oxygen and carbon dioxide are exchanged
  3. 4. Main muscle involved in breathing
  4. 6. Passageway for air from the nose to the larynx
  5. 7. Tube that carries air to the bronchi