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