CARDIOVASCULAR SYSTEM

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Across
  1. 3. Innermost lining of blood vessels
  2. 6. Gas that enters the body through the lungs and travels to the heart
  3. 7. Small vein
  4. 8. Contraction phase of the heartbeat
  5. 10. Thin-walled vessel that carries blood from body tissues and lungs back to the heart
  6. 11. small artery
  7. 13. two upper chambers of the heart
  8. 14. Muscular middle layer of the heart
Down
  1. 1. valve Valve between the left atrium and left ventricle;bicuspid valve
  2. 2. Beat of the heart as felt through the walls of the arteries
  3. 4. Relaxation phase of the heartbeat
  4. 5. Inner lining of the heart
  5. 9. largest artery in the body
  6. 10. One of two lower chambers of the heart
  7. 12. smallest type of blood vessel