The Cardiovascular System

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Across
  1. 2. smallest blood vessels
  2. 3. the outermost protective layer of the heart
  3. 6. a surgical connection between two structures
  4. 8. helps pump blood back to the heart
  5. 12. when the heart muscle relaxes
  6. 14. one of two upper chambers in the heart that receives blood
  7. 16. a blood vessel that carries blood to the heart form tissues and organs
  8. 17. a fluid filled cavity in the heart or brain
  9. 18. favorite color is blue
  10. 19. a protective, fluid filled sac that surrounds the heart
  11. 20. period of contraction of the ventricles
  12. 21. the product of heart rate and stroke volume
Down
  1. 1. a special muscle tissue that forms the heart
  2. 4. a small blood vessel that receives blood from the capillaries
  3. 5. small blood vessels
  4. 7. the widening of blood vessels
  5. 9. makes electrical signal that causes heart chambers to contract
  6. 10. a blood vessel that carries blood from the heart to tissues and organs
  7. 11. flaps that act as gate for blood
  8. 13. narrowing of blood vessels
  9. 15. creates blood pressure