The Heart

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Across
  1. 5. This is a three flap or cusp valve that prevents backflow of blood from the right ventricle to the right atrium
  2. 7. In the cardiac cycle, the contraction of the myocardium
  3. 9. The area of the brain that contains the cardiac centers to regular heart rate
  4. 10. A single upper chamber of the heart
  5. 11. The unit of contraction with cardiac muscle cells
  6. 12. An area of necrotic tissue due to prolonged lack of blood supply
Down
  1. 1. The serous membrane on the surface of the myocardium
  2. 2. An irregular heartbeat
  3. 3. Deprived blood supply to the myocardium
  4. 4. A very rapid and uncoordinated ventricular beat
  5. 6. The largest artery in the body
  6. 8. Serous membrane on the surface of the myocardium