heart crossword

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Across
  1. 2. valve between the left atrium and the left ventricle
  2. 3. thin walled vessel that carries blood from body tissues and lungs back to the heart
  3. 4. beat of the heart as felt through the walls of the arteries
  4. 5. relaxation phase of the heartbeat
  5. 7. contraction phase of the heartbeat
  6. 8. double layered membrane surrounding the heart
  7. 11. one of two upper chambers of the heart
  8. 12. structure in veins or in the heart that temporarily closes an opening
  9. 13. muscular middle layer of the heart
  10. 15. gas that enters the blood through the lungs
  11. 16. two common carotid arteries located on either side of the neck
  12. 18. small vein
  13. 19. smallest type of blood vessel
Down
  1. 1. innermost lining of blood vessels
  2. 3. one of two lower chambers in the heart
  3. 6. largest artery in the body
  4. 9. small artery
  5. 10. inner lining of the heart
  6. 12. largest vein in the body
  7. 14. largest type of blood vessel
  8. 17. partition or wall dividing a cavity