I heart you

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Across
  1. 3. lining within the heart
  2. 4. type of vein that carries blood from lungs to the heart
  3. 7. thickest layer of the heart wall
  4. 8. pertaining to the upper chamber of the heart
  5. 11. lower chamber of the heart
  6. 12. superior and inferior veins that bring blood back to the heart
  7. 14. membrane surrounding the heart
Down
  1. 1. heart beat
  2. 2. smallest blood vessel
  3. 5. largest vessel in the body
  4. 6. part of the heartbeat during relaxation
  5. 9. surgical repair of blood vessel
  6. 10. valve between left atrium and left ventricle
  7. 11. responsible for direction of blood flow
  8. 13. lowest point of the heart