Across
- 3. Makes sure blood doesn't flow backward
- 7. Vessels thinner than arteries
- 10. Artery to head and neck
- 12. Full of oxygen
- 13. cavae Two large, oxygen-deficient veins
- 14. Heart beat
- 15. Carries deoxygenated blood toward the heart
Down
- 1. Microscopic vessels
- 2. veins veins that carry oxygenated blood.
- 4. Innermost layer of arteries
- 5. Carry blood away from the heart
- 6. Largest artery
- 8. dioxide Passes out of a cell when oxygen goes in
- 9. artery Divided vessel leading to lungs
- 11. Blood filled with waste travels through these