Respiratory System

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Across
  1. 2. Windpipe
  2. 4. Air enters
  3. 6. Muscle beneath the lungs that helps with breathing
  4. 7. Lungs
Down
  1. 1. Voice Box
  2. 3. Cartilage flap that alternately covers the trachea or esophagus
  3. 5. Air travels here after it enters through the nose or mouth