Respiratory System

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Across
  1. 4. A word that means 'to do with the lungs'
  2. 6. A flap of skin that prevents food from entering the windpipe.
  3. 7. Tiny veins that allow for gas exchange
Down
  1. 1. A simple sugar that cells use as fuel.
  2. 2. A tiny cluster-like structure covered in capillaries
  3. 3. The release of energy from food.
  4. 5. A muscle that controls the volume of the lungs.