The Heart

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Across
  1. 2. The ____ valves close when the ventricles relax.
  2. 5. The ____ valves close when the ventricles contract.
  3. 7. Another term for heart attack
  4. 8. The thicker-walled chambers of the heart.
  5. 11. The ___ septum separates the left and right atria
  6. 13. Inflammation of pericardium or heart wall
  7. 15. The ______ valve allows blood to flow from the right atrium to the right ventricle.
Down
  1. 1. pacemaker of the heart.
  2. 3. The visceral layer of the heart's serous pericardium.
  3. 4. Earlike extensions covering the atria on the surface of the heart.
  4. 6. After birth, the foramen ovale eventually forms into this structure.
  5. 9. The heart's blood supply comes from ______ circulation.
  6. 10. These drain 20% of cardiac muscle's blood to the chambers
  7. 12. Cardiac muscle of the heart.
  8. 14. The ____ fibers spread electrical impulse through the ventricular myocardium.