The Respiratory System

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Across
  1. 2. The small air sacs where oxygen and carbon dioxide exchange happens.
  2. 4. The main muscle used when breathing.
  3. 5. The main organs of the respiratory system.
  4. 6. The tiny hair-like projections lining the trachea and bronchi.
  5. 7. The long tube that leads from the nasal cavity to the lungs.
Down
  1. 1. Small holes in the nose where air enters and leaves the body.
  2. 3. Another name for the trachea.