Across
- 1. connect arteries and veins
- 4. abnormal rhythm of the heart
- 7. main vein that carries blood from legs to heart
- 9. heart beating too fast
- 10. carries blood to the heart
Down
- 2. carries blood away from the heart
- 3. when a valve doesn't open enough to let blook flow through
- 5. allows blood to flow in one direction
- 6. heart beating too slow
- 8. main organ of the circulatory system