Heart

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Across
  1. 7. Largest type of blood vessel; carries blood away from the heart to all parts of the body.
  2. 8. Specialized nervous tissue in the right atrium that begins the heartbeat.
  3. 10. Record of electrical activity of the heart.
  4. 12. Muscular middle layer of the heart.
  5. 14. Relaxation phase of the heartbeat.
Down
  1. 1. Double-layered membrane surrounding the heart.
  2. 2. Beat of the heart as felt through the walls of the arteries.
  3. 3. Small artery
  4. 4. Inner lining of the heart.
  5. 5. Contraction phase of the heartbeat.
  6. 6. Partition or wall dividing a cavity.
  7. 9. Largest artery in the body
  8. 11. Abnormal swishing sound caused by improper closure of the heart valves.
  9. 13. Smallest type of blood vessel.
  10. 15. Gas that enters the blood through the lungs and travels to the heart to be pumped via arteries to all body cells.