respiratory system

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Across
  1. 3. to make something increase in size by filling it with air
  2. 5. a cartilaginous tube that connects the larynx to the bronchi of the lungs
  3. 6. curved bones forming a cage, protecting vital organs (heart, lungs)
Down
  1. 1. let the air out of something
  2. 2. a muscle that helps you inhale and exhale
  3. 4. the primary organs of respiration, a pair of spongy organs in your chest