Circulatory System

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