The Circulatory System

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Across
  1. 3. give blood its red color
  2. 5. upper chamber that retrieves the blood
  3. 7. a muscle in the body that pumps blood through the blood vessels to the tissues and cells
  4. 8. very small blood vessels that pick up waste products
  5. 10. outer layer of the heart that covers the sac
  6. 11. recieves blood from the lungs
  7. 14. also called erythrocytes.
  8. 15. membrane that lines the inner surface of the heart
  9. 17. valve between the right atrium and right ventricle
  10. 18. carry blood away from the heart
  11. 19. return blood back to the heart
Down
  1. 1. the thick, muscular part of the heart
  2. 2. receives blood from the body tissues
  3. 4. valve between the left atrium and left ventricle, also called mitral
  4. 6. also called leukocytes, fight off infection
  5. 9. largest artery that receives blood from the left ventricle
  6. 12. allow blood to flow in one direction and keeps blood from flowing back into the atria
  7. 13. pump the blood
  8. 16. smallest branch of an artery