The Heart

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Across
  1. 2. number of stages in the cardiac cycle
  2. 3. relaxation of heart muscles
  3. 7. coronary artery carries ____ blood
  4. 8. blood flows to the rest of the body via the ____
  5. 11. circulation of blood to the lungs
  6. 12. membrane surrounding the heart
  7. 13. _____ systole occurs when atria contract
  8. 15. found between left and right ventricles
Down
  1. 1. ____ atrium receives oxygenated blood
  2. 4. ____ vena cava transports deoxygenated blood to the heart
  3. 5. smooth lining of heart chambers
  4. 6. lower chambers
  5. 9. ____ valve closes when deoxygenated blood flows to lungs
  6. 10. base of the heart
  7. 14. number of chambers