Cardiovascular system

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Across
  1. 3. condition of a fast heartbeat
  2. 6. also known as an ECG or EKG
  3. 9. carries blood away from the heart to all parts of the body
  4. 12. begins the heartbeat in the right atrium
  5. 13. when the heart contracts
  6. 14. when the heart relaxes
  7. 15. wall that divides the atrium and ventricle
Down
  1. 1. membrane that surrounds the heart
  2. 2. condition of a slow heartbeat
  3. 4. smallest type of blood vessel
  4. 5. is caused by improper closure of the heart valves
  5. 7. muscular middle layer of the heart
  6. 8. lower tip of the heart
  7. 10. small artery
  8. 11. gas released by body through exhalation