Structure of the Working Heart

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Across
  1. 1. The valve must close before blood will flow from the heart to the body regions
  2. 6. Visceral layer of the pericardium
  3. 8. Thick, muscular walled chambers. Pumps blood out of the heart through arteries.
  4. 9. The artery containing the greatest amount of oxygenated blood pressure
  5. 11. Endothelial layer of the inner myocardial surface
  6. 12. The walled chambers that receive blood returning to the heart through veins
  7. 13. Cardiac muscle layer forming the bulk of the heart
Down
  1. 2. Major route of blood from lower body to heart
  2. 3. The artery leading from the heart which contains deoxygenated blood
  3. 4. The vessel that returns blood from the head, neck, and arms to the heart
  4. 5. The heart valve that has three flaps or cusps
  5. 7. Blood, high in oxygen, returns to the heart by means of this vessel
  6. 10. Seperates the right and left sides of the heart