cardiovascular

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Across
  1. 2. waste released by body cells
  2. 5. largest type of blood vessel
  3. 6. smallest blood vessel
  4. 8. valve between the right atrium and right ventricle
  5. 11. membrane surrounding the heart
  6. 13. small artery
  7. 15. lower chambers of the heart
Down
  1. 1. largest artery in the body
  2. 3. relaxation of the heart
  3. 4. middle layer of heart muscle
  4. 7. upper chambers of the heart
  5. 9. carry oxygen rich blood to heart muscle
  6. 10. small vein
  7. 12. innermost lining of blood vessels
  8. 14. contraction of the heart