Cardiovascular system

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Across
  1. 5. The membrane surrounding the heart which is a double layer
  2. 8. The pacemaker that is a part of the heart
  3. 10. The artery in the body which is the largest
  4. 11. The wall dividing a cavity
  5. 12. one of the lower chambers of the heart
  6. 14. The name of the process that includes the flow of blood from tissues of the body to the heart and from the heart back into the body
Down
  1. 1. The instrument one uses to measure blood pressure
  2. 2. The blood vessel in the body which is the smallest
  3. 3. The phase of the heartbeat in which it contracts
  4. 4. The beat produced by the heart which is felt through the arteries
  5. 6. The structure that controls the flow of blood in the veins and in the heart
  6. 7. The inner lining of the heart
  7. 9. The valve which is located between the right ventricle and the pulmonary artery
  8. 13. The middle layer of the heart which is muscular
  9. 15. The swishing sound that arises due to the improper closure of the valves of the heart