Across
- 2. small blood vessels that connect arteries and veins
- 5. brings blood to the heart
- 6. synthesized in red marrow
- 9. carry oxygenated blood from the lungs
- 11. the innermost layer of the heart wall
- 12. carrying blood from the right ventricle
- 14. white blood cells
Down
- 1. the middle layer of the heart's wall,
- 3. the body's largest artery
- 4. lower chambers of a heart
- 5. very large vein
- 7. brings blood away from the heart
- 8. a sac-like membrane that surrounds the heart
- 10. upperchambers of a heart
- 13. disk shaped