Heart

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Across
  1. 2. abnormally slow heart rate
  2. 3. valve that prevents backflow in left atrium
  3. 10. blood circulation between heart and lungs
  4. 11. SA node is also known as the
  5. 13. (AV) valve with three flaps
  6. 15. abnormally fast heart rate
Down
  1. 1. the inner lining of the heart
  2. 4. prevents backflow into the left ventricle
  3. 5. serous layer covering the heart muscle
  4. 6. discharging chambers of the heart
  5. 7. blood circulation between heart and body
  6. 8. outermost layer of the serous pericardium
  7. 9. heart muscle
  8. 12. receiving chambers of the heart
  9. 14. innermost layer of the serous pericardium