The Heart

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Across
  1. 3. Protein transporting oxygen in the blood
  2. 4. Valve between the left atrium and left ventricle
  3. 7. Node that sets the heart’s natural pace
  4. 8. Phase of the heartbeat when ventricles relax
  5. 9. Muscular layer of the heart wall
  6. 11. Major vein returning deoxygenated blood to the heart
  7. 12. Type of arteries supplying the heart muscle
  8. 14. Upper chamber of the heart that receives blood
  9. 15. Wall dividing the left and right sides of the heart
  10. 17. Describes circulation between heart and lungs
  11. 18. Phase of the heartbeat when ventricles contract
  12. 19. Structure that prevents backflow of blood
  13. 20. Protective sac surrounding the heart
Down
  1. 1. Amount of blood pumped per heartbeat
  2. 2. Structure that initiates the heartbeat rhythm
  3. 5. Largest artery carrying oxygenated blood to the body
  4. 6. Recording of the heart’s electrical activity
  5. 10. Total blood pumped by the heart per minute
  6. 13. Lower chamber responsible for pumping blood out
  7. 16. Valve between the right atrium and right ventricle