Cardiovascular System

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Across
  1. 1. Cells that display pacemaker activity and initiate action potentials
  2. 4. Smallest diameter vessels formed when arterioles branch
  3. 8. Valve that does not open completely and causes whistling sound
  4. 10. Vessels that carry blood from the heart
  5. 11. Phase that results from slow Ca2+ entry coupled with reduced efflux of K+
  6. 14. Pathway that conducts the pacemaker activity from the right to left atrium
  7. 16. Node that leads activity for other pacemakers; has 70 AC/min
  8. 18. Middle layer of heart wall
  9. 19. TENDINEAE Tendinous fibers attached to inside edges of AV valves that prevent eversion
  10. 21. Contraction and emptying
  11. 23. ______ circulation is used by the right ventricle to pump blood to lungs
  12. 24. Vessels that carry blood to the heart
Down
  1. 2. Pathway that conducts pacemaker activity from SA nodes to AV nodes
  2. 3. External membrane covering the heart and is filled with pericardial fluid to prevent friction
  3. 5. ______ circulation is used by the left ventricle to pump blood to body tissues
  4. 6. The second heart sound “dup” comes from the closure of ______ valves
  5. 7. Blood pressure above 140/90 mm Hg
  6. 9. Bulk flow into the tissues
  7. 12. Relaxation and Filling
  8. 13. 88% of blood flows to _____ muscles when exercising
  9. 15. FAILURE Inability of cardiac output to meet demands of the body
  10. 17. Valve that does not close completely and causes swishing sound
  11. 18. Abnormal heart sounds
  12. 20. Bulk flow into capillaries
  13. 22. VOLUME Volume of blood pumped out by each ventricle per beat