Cardiovascular System

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Across
  1. 1. Blood cell that protects the body against infection.
  2. 3. Blood cell that carries O2 and CO2 around the body.
  3. 6. Middle layer of the heart wall.
  4. 10. Vein that takes blood back from the lungs to the heart.
  5. 12. Outermost layer of the heart wall.
  6. 14. Type of blood vessel where gas exchange occurs.
  7. 15. Upper two chambers of the heart.
Down
  1. 2. Innermost layer of the heart wall.
  2. 4. Type of blood vessel that carries blood away from the heart.
  3. 5. Main artery of the body that sends the blood it gets from the left ventricle around the body.
  4. 7. Lower two chambers of the heart.
  5. 8. Blood cell that clots to prevent bleeding.
  6. 9. Artery that takes blood from the heart to the lungs.
  7. 11. Large vein that carries blood from the body to the heart.
  8. 13. Type of blood vessel that carries blood towards the heart.