Cardiovascular System Part 1

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Across
  1. 3. Two largest veins in the body(two words)
  2. 5. Muscular middle layer of the heart
  3. 8. Weighs less than a pound
  4. 10. Double layer membrane that surrounds the heart
  5. 12. Contraction of the heartbeat
  6. 13. Beat of the heart you feel through the walls of the arteries
  7. 14. Records electrical activity of the heart
Down
  1. 1. One of two upper chambers of the heart
  2. 2. Smallest type of blood vessel
  3. 3. One of two lower chambers of the heart
  4. 4. The inner lining of the heart
  5. 6. Relaxation of the heartbeat
  6. 7. Specialized nervous tissue in the right atrium that begins the heartbeat
  7. 9. Small vein
  8. 11. Abnormal swishing sound