Cardiovascular system

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Across
  1. 1. carries blood to the heart
  2. 5. how many chambers are in mammals hearts
  3. 7. force of the blood stretching arteries
  4. 8. largest vein in the body
  5. 9. where the blood goes to exchange CO2 for Oxygen
  6. 12. the gas found in blood in arteries
  7. 13. top chambers of the heart
  8. 14. largest artery in the body
  9. 15. gas found in the blood in veins
  10. 16. blood pressure when the heart is at work
  11. 17. heart rate range where heart should be before workout
  12. 18. beating of heart to pump blood through body
Down
  1. 2. instrument used to hear heart beat
  2. 3. blood pressure when heart is at rest
  3. 4. only artery in the body that carries de-oxygenated blood to the lungs
  4. 6. only vein in the body that carries oxygenated blood to the lungs
  5. 8. doesn't allow blood to flow backwards in heart
  6. 10. carries blood away from the heart
  7. 11. bottom chambers of the heart