Structure of the Heart

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