Medical Puzzle

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Across
  1. 3. The study of the structure of the body.
  2. 4. A doctor's "instrument" for listening to the heart.
  3. 6. The branch of medicine focused on children.
  4. 7. The tube connecting the mouth and stomach.
Down
  1. 1. A common injection site.
  2. 2. The body's natural painkillers.
  3. 4. The largest organ of the human body.
  4. 5. The abbreviation for "emergency medical services."