Respiratory System

12345678
Across
  1. 3. a large membranous tube reinforced by rings of cartilage
  2. 4. the action of breathing
  3. 6. the muscles between your ribs
  4. 8. a thin skeletal muscle that separates the abdomen from the chest
Down
  1. 1. tubes that carry air into the lungs and branch into smaller tubes
  2. 2. inhaling
  3. 5. a condition in which a persons airways become inflamed
  4. 7. a gas that living organisms need