Circulatory System

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Across
  1. 5. white blood cell.
  2. 6. vein that does not meet up with the vena cava.
  3. 12. heart valve.
  4. 13. supply blood to heart.
  5. 15. heart muscle.
  6. 16. when heart is relaxed.
  7. 17. cardiac muscle in short oxygen supply.
  8. 18. influence of carbon dioxide concentration on heart rate.
  9. 20. blood clot.
Down
  1. 1. component of blood.
  2. 2. Scientist who demonstrated the one-way action of valves.
  3. 3. inorganic element in blood.
  4. 4. left atrium receives from.
  5. 7. measurement of heart activity.
  6. 8. blood vessel.
  7. 9. carry blood away from heart.
  8. 10. carry deoxygenated blood.
  9. 11. involved in blood clotting.
  10. 14. controls heart beat.
  11. 19. circulatory system in humans.