The Respiratory System

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Across
  1. 4. contracts and relaxes and moves air in and out of the lungs
  2. 6. a system of organs
  3. 8. a tubelike passageway at the top of the throat
Down
  1. 1. bronchioles that end in microscopic sacs
  2. 2. the main organs of the respiratory system
  3. 3. movement of air
  4. 5. air that passes from the pharynx into a triangle-shape
  5. 7. the trachea branches into 2 narrower tubes