Across
- 2. Red blood cells
- 4. One-way "swinging doors" in the heart
- 6. The heart has this many chambers
- 8. Place where oxygen and waste are exchanged
- 10. Main artery that carries blood from the heart
- 11. Carry blood back to the heart
- 12. Carry blood away from the heart
Down
- 1. Pushes blood out to the body
- 3. Pushes blood to the lungs
- 5. White blood cells
- 7. Responsible for clotting blood
- 9. Watery part of blood