Cardiovascular system

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Across
  1. 7. Reduction in resting heart rate in athletes
  2. 9. The volume of blood leaving the ventricles per beat
  3. 11. The chillout room of the heart
  4. 14. The number of heart beats per min
  5. 15. Term for contraction
  6. 16. Term for relaxation
  7. 17. The pacemaker of the heart
  8. 19. Nervous system used more in recovery
  9. 20. The spreader of electricity through the ventricles
Down
  1. 1. The arteries feeding the heart itself
  2. 2. The volume of blood leaving the ventricles per min
  3. 3. Increase in heart size
  4. 4. The name of the valve between right atrium and ventricle
  5. 5. The artery taking oxygenated blood to the body
  6. 6. Place where diffusion occurs
  7. 8. Carrier of oxygen in the blood
  8. 10. Released before exercise to cause anticipatory rise
  9. 12. The connector of the AVnode to the septum
  10. 13. The nervous system that increases heart rate
  11. 18. Name of the top chambers