Across
- 3. small artery branches that are only one cell thick
- 6. help blood clot
- 8. main organ of the circulatory system
- 9. gets blood from the right atrium
- 11. thick powerful muscle that pumps blood through the aorta
- 13. receives blood from the lungs
- 14. blood travels away from the heart through these
Down
- 1. carry blood to the heart
- 2. the push of blood against the walls of the blood vessels
- 4. liquid part of blood
- 5. receives blood from the rest of the body
- 7. protect the body from infection
- 10. gives blood its bright red color
- 12. number of chambers in the heart