Circulatory System

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Across
  1. 3. a fibrous sac surrounding the heart
  2. 6. most of the oxygen-depleted blood will return to this area
  3. 8. pumps blood into the pulmonary artery and lungs
  4. 12. this connects the AV valves to the muscles that extend upwards from the myocardium
  5. 14. receives oxygenated blood from the lungs
  6. 15. feminine version of keanu; last name rhymes with melon
  7. 18. a larger,elastic artery
  8. 19. a thoracic compartment; where the heart is located
  9. 20. the heart is made up of four _______
  10. 21. also known as a groove
Down
  1. 1. blood exits the right ventricle through this
  2. 2. these open blood enters the aorta and pulmonary trunk arteries
  3. 4. these join myocytes in the muscle
  4. 5. alternating dark and light bands
  5. 7. a thick myocardial wall separating the two ventricles
  6. 9. pumps blood through the long systemic circulatory system
  7. 10. expands the volume of the chamber; small earshaped appendage
  8. 11. great and small cardiac veins merge with this; also empties into the right atrium
  9. 13. outer layer of the heart wall
  10. 16. the narrow end of the heart
  11. 17. this layer of the heart wall covers the heart valves and tendons