The Circulatory System

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Across
  1. 2. blood vessel that carries blood only to the heart
  2. 3. the liquid in which blood cells flow
  3. 5. organ that pumps blood around the body
  4. 7. part of the heart that controls the direction of blood flow
  5. 9. the main artery leading from the heart to the body
  6. 11. carry blood around the body
  7. 13. an emergency that occurs when blood flow to the heart muscle is blocked
  8. 14. the substance that causes platelets to stick together
  9. 15. the cells that pick up oxygen and deliver it to cells
  10. 16. carries blood towards the heart
Down
  1. 1. where materials are exchanged between the blood and the body's cells
  2. 3. help the blood form clots
  3. 4. carries blood away from the heart
  4. 6. cells that fight infections
  5. 8. substance that flows through blood vessels
  6. 9. upper chambers of the heart
  7. 10. lower chambers of the heart
  8. 12. red blood cells travel to the lungs to pick up _____