Cardiovascular system-blood

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Across
  1. 5. upper champers,receive blood
  2. 7. contraction
  3. 9. unusual heart beat sound
  4. 12. lower chambers discharge blood
  5. 13. disease of hartmuscle that makes it harder to pump blood.
  6. 16. red blood cells
  7. 18. venous valves weaken
  8. 19. a serous membrane that surrounds the heart
  9. 20. small beds that drain capillary beds
  10. 21. blood flow to an area of the brain is blocked
Down
  1. 1. Left AV valve
  2. 2. slow heart rate
  3. 3. leading cause of death
  4. 4. to hear heart
  5. 6. rapid heart rate
  6. 8. SA node
  7. 10. this is the layer of the heart wall that actually contracts.
  8. 11. relaxation
  9. 14. right AV valve
  10. 15. feed small capillary beds
  11. 17. weakened valves in large veins