CROSSWORD

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Across
  1. 2. regulates impulses between atria and ventricles.
  2. 5. an abnormal heart rhythm.
  3. 8. middle muscle layer of the heart
  4. 9. insufficient oxygenation of tissue
  5. 10. a slow heart rate.
Down
  1. 1. fast heart rate
  2. 3. outermost layer of the heart.
  3. 4. a sac that encases the heart
  4. 6. a device that produces stimulation to heart.
  5. 7. largest artery in the human body.