Across
- 2. White blood cells are also called these
- 5. These are the smallest blood vessels
- 6. This is what gives blood its red color
- 7. The heart pumps this
- 8. The cardiovascular system circulates this _______
- 11. The cardiovascular system transports this ____
- 12. This is the most important organ in the cardiovascular system
Down
- 1. The heart ________ 100,000 times a day
- 3. These are what prevent blood from flowing the wrong direction
- 4. The cardiovascular system removes this ____
- 9. These carry blood to the heart
- 10. These carry blood away from the heart