Unit 4 pg 71-73

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Across
  1. 3. A condition where arteries narrow and harden
  2. 5. A protein on red blood cells that determines blood type
  3. 7. The electrical signal that regulates heart contractions
  4. 9. A type of white blood cell that helps the immune system
  5. 11. A disorder where the body produces too many white blood cells
  6. 13. The structure that prevents blood from flowing backward in veins
  7. 15. A procedure used to open blocked arteries.
  8. 18. A network of vessels that return fluid to the bloodstream.
  9. 19. The smallest blood vessels in the body
  10. 20. The primary function of red blood cells
Down
  1. 1. A condition where the heart beats too fast
  2. 2. The largest part of the heart responsible for pumping blood
  3. 4. The phase of the heartbeat when the heart contracts
  4. 6. A condition where the heart beats too slow.
  5. 8. A genetic disorder affecting hemoglobin structure
  6. 10. A device used to regulate an abnormal heartbeat
  7. 12. The phase of the heartbeat when the heart relaxes
  8. 14. The number of chambers in the heart
  9. 16. A condition caused by insufficient red blood cells
  10. 17. The structure that connects arteries and veins