Across
- 4. largest type blood vessel
- 7. blood vessels branching from aorta
- 10. smallest blood vessel
- 12. specialized tissue in the wall between the atria
- 13. Innermost lining of blood vessels
- 14. gas waste produced by the body
Down
- 1. record of the electricity flowing through the heart
- 2. Specialized muscle fibers connecting the atria with the ventricles
- 3. Small artery
- 5. inner lining of the heart
- 6. Valve between the left atrium and the left ventricle
- 8. bllod that is oxygen poor
- 9. one of two upper chambers of the heart
- 11. Largest artery in the body
- 15. relaxation phase of the heart