The circulatory system

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Across
  1. 5. name of the upper chambers of the heart (singular)
  2. 6. iron-containing protein that binds chemically to oxygen molecules. it is found in the blood
  3. 9. largest artery in the body
  4. 11. a type of cell found in the blood that fight disease
  5. 12. blood vessles that carry blood away from the heart
  6. 13. hollow, muscular organ that pumps blood throughout the body
  7. 14. the liquid part of blood
  8. 15. blood vessles that carry blood back to the heart
  9. 16. the process by which molecules move from an area of higher concentration to an area of lower concentration
  10. 17. this type of cell is found in the heart and sends out electrical impulses that make the heart muscle contract
Down
  1. 1. a system within the body made up of the heart, blood vessels, and blood
  2. 2. a flap of tissue that prevents blood from flowing backward
  3. 3. these cells carry oxygen in the blood and deliver it to cells elsewhere in the body
  4. 4. name of the lower chambers of the heart (singular)
  5. 7. the alternating expansion and relaxation of the artery walls. If you feel your wrist you will feel your ________
  6. 8. a force exerted by blood against the walls of blood vessels. Someone might have low or high _________ ___________
  7. 10. place where substances are exchanged between the blood and body cells. The smallest type of blood vessel (plural).