Cardiovascular System

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Across
  1. 2. Double-layered membrane surrounding the heart
  2. 3. Innermost lining of blood vessels
  3. 6. Small artery
  4. 8. blood Blood that is oxygen-poor
  5. 9. Relaxation phase of the heartbeat
  6. 10. Largest artery in the body
  7. 12. Smallest type of blood vessel
  8. 14. Small vein
Down
  1. 1. Instrument to measure blood pressure
  2. 4. Inner lining of the heart
  3. 5. Contraction phase of the heartbeat
  4. 7. One of two lower chambers of the heart
  5. 10. One of two upper chambers of the heart
  6. 11. Beat of the heart as felt through the walls of the arteries
  7. 13. Lower tip of the heart