RESPIRATORY

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Across
  1. 2. Increases the surface area of the small intestine
  2. 5. Membrane that protect the lungs.
  3. 8. Helps to swallow and push the food into the food pipe
  4. 9. Another name of salivary amylase.
  5. 10. Voice box which produces sound
Down
  1. 1. Small sacs present at the end of each bronchioles.
  2. 3. Muscular flap which prevents the entry of food into the wind pipe
  3. 4. Enzyme which converts casein into curd
  4. 6. Narrowing of air passages
  5. 7. Hardest material in the human body