The Cardiovascular System

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Across
  1. 2. Structure in veins or in the heart that temporarily closes an opening so that blood flows in only one direction
  2. 5. Double-layered membrane surrounding the heart
  3. 7. One of 2 upper chambers of the heart
  4. 9. Innermost lining of the heart
  5. 10. Smallest type of blood vessel
  6. 13. Inner lining of the heart
  7. 14. Abnormal swishing sound caused by improper closure of the heart valves
  8. 15. Gas that enters the blood through the lungs and travels to the heart to be pumped via arteries to all body cells
Down
  1. 1. One of 2 lower chambers of the heart
  2. 3. Small artery
  3. 4. Largest artery in the body
  4. 6. Largest type of blood vessel
  5. 8. Muscular middle layer of the heart
  6. 11. Beat of the heart as felt through the walls of the arteries
  7. 12. Small vein