respiratory system

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Across
  1. 2. the cavity at the rear of the mouth
  2. 8. tiny air sacs in the lungs
  3. 9. under the trachea and lead to lungs
  4. 10. when exhaling, it passes outside the blood
Down
  1. 1. when we inhale, the pressure in the lungs
  2. 3. it filters the air we breathe
  3. 4. it damages the respiratory system
  4. 5. the earthworms breathe through their
  5. 6. when we exhale, the diaphragm
  6. 7. when inhaling, oxygen passes into