The Cardiovascular System

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