The Respiratory System

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Across
  1. 2. muscle that inflates and deflates the lungs
  2. 4. what we breathe out
  3. 7. small air tubes
  4. 8. pipe that sends air to lungs
  5. 10. Smelling source
  6. 11. any of the fine branching blood vessels
Down
  1. 1. when gas is exchanged between the alveoli and lung capillaries
  2. 3. organ that collects air
  3. 5. What we use to breathe
  4. 6. tiny air sacs at the end of the bronchioles
  5. 7. found at the end of the trachea
  6. 9. each of a series of slender curved bones