Be still my heart..

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Across
  1. 3. Smallest type of blood vessel
  2. 6. Largest artery in the body
  3. 8. Contraction phase of the heartbeat
  4. 9. One of two lower chambers of the heart
  5. 12. inner lining of the heart
  6. 13. Innermost lining of blood vessels
  7. 15. Muscular middle layer of the heart
Down
  1. 1. Valve between the left atrium and the left ventricle
  2. 2. Partition or wall dividing a cavity
  3. 4. small artery
  4. 5. Gas that enters the blood through the lungs and travels to the heart to be pumped via arteries to all body cells
  5. 7. Lower tip of the heart
  6. 10. Valve located between the right atrium and the right ventricle
  7. 11. term for arm
  8. 14. Relaxation phase of the heartbeat
  9. 15. Abnormal swishing sound caused by improper closure of the heart valves