Cardiovascular System

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Across
  1. 3. Thin-walled vessel that carries blood from body tissues and lungs back to the heart.
  2. 7. Double-layered membrane surrounding the heart
  3. 10. Muscular middle layer of the heart.
  4. 11. Specialized nervous tissue in the right atrium that begins the heartbeat.
  5. 12. Beat of the heart as felt through the walls of the arteries
  6. 14. contraction phase of the heartbeat.
  7. 15. Largest artery in the body
Down
  1. 1. Inner lining of the heart
  2. 2. Innermost lining of blood vessels
  3. 4. Valve between the left atrium and the left ventricle; Bicuspid
  4. 5. Valve located between the right atrium and the right ventricle; it has three left lets or cusps.
  5. 6. Partition or wall dividing a cavity; such as between the right and left atria.
  6. 8. Smallest type of blood vessel
  7. 9. Relaxation phase of the heartbeat.
  8. 10. Abnormal swishing sound caused by improper closure of heart valves.
  9. 13. carries blood away from the heart to all parts of the body.