Across
- 2. of the heart are composed of the cardiac muscle.
- 7. contains blood on the right side.
- 8. what have wall one cell thick.
- 10. Direction blood flow in.
- 12. what ensure blood flow one direction.
Down
- 1. contain blood on the left side.
- 3. carry blood away from the heart.
- 4. what separates the two sides.
- 5. has thick walls.
- 6. has thin walls.
- 9. consist of how many chambers.
- 11. carry blood to the heart.