Repiratory System

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Across
  1. 2. your vocal chords.
  2. 3. your throat.
  3. 4. the final branch of a bronchi.
  4. 7. tiny sacs and the ends of bronchioles that fill with oxygen and diffuse oxygen into the smallest blood vessel.
  5. 8. a muscle at the bottom of your lungs that help the lungs expand and contract.
  6. 9. tubes that branch of your windpipe and in your lungs and continue branching off from there.
Down
  1. 1. your windpipe.
  2. 2. the main organ of your respiratory system.
  3. 5. tiny hairs that trap unwanted particles.
  4. 6. the smallest blood vessel, diffuse carbon dioxide into the tiny sacs at the ends on bronchioles.