Heart

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Across
  1. 3. a doctor who specializes in the study or treatment of heart diseases and heart abnormalities
  2. 4. an abnormally slow heart action
  3. 6. an instrument that graphically registers movements of the heart
  4. 9. chronic disease of the heart muscle
Down
  1. 1. the innermost layer of the heart
  2. 2. an abnormally rapid heart rate
  3. 5. enlargement of the heart
  4. 6. the study of the heart and its action and diseases
  5. 7. inflammation of the heart
  6. 8. the outermost layer of the heart