cardiovascular system

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Across
  1. 3. Gas that enters the blood in lungs
  2. 4. Largest artery in the body.
  3. 5. Double-layered membrane around heart
  4. 10. Smallest type of blood vessel.
  5. 11. Relaxation phase of the heartbeat.
  6. 13. Innermost lining of blood vessels.
  7. 14. Special nervous tissue of right atrium
  8. 15. Muscular middle layer of the heart.
  9. 16. Abnormal swishing sound of the heart
Down
  1. 1. Small vein.
  2. 2. One of two lower chambers of the heart.
  3. 6. Small artery.
  4. 7. vessel carrying blood to the heart
  5. 8. Regulators of blood flow in the heart or vein
  6. 9. Contraction phase of the heartbeat
  7. 12. Inner lining of the heart.