HUMAN RESPIRATORY SYSTEM

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Across
  1. 4. common passage for food and air
  2. 7. pair of spongy organs
  3. 9. prevents the food from entering windpipe.
  4. 10. protected by the ribcage
Down
  1. 1. two tubes leading in the lungs
  2. 2. breathing without oxygen
  3. 3. helps in the movement of rib cage
  4. 5. air rushes out of the nose
  5. 6. diaphragm is pulled downwards
  6. 8. keeps the airway clean