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