Respiration and the respiratory system

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Across
  1. 2. the large muscle that helps our lungs to inflate and deflate.
  2. 4. the gas we breathe in.
  3. 6. one place that air enters and exits our body.
  4. 8. the gas we breathe out.
  5. 10. two smaller tubes that connect the trachea. to each lung.
  6. 11. when we do this, the diaphragm expands.
Down
  1. 1. the smallest bronchi.
  2. 3. tiny air sacs at the end of each bronchiole.
  3. 5. found in the alveoli, gas exchange takes. place here.
  4. 7. a long tube that goes down the chest.
  5. 9. when we do this, the diaphragm contracts (becomes smaller)