BI-1151
Arteries, veins and capillaries
Biology · Secondary 3 · Medium · Arteries, veins and capillaries
A person has damaged valves in a leg vein. Which statement best explains why this can lead to varicose veins?
- Damaged valves cause blood to flow faster, stretching the vein.
- Damaged valves allow backflow, so blood accumulates and enlarges the vein.
- Damaged valves make the vein wall thicker, so it looks larger.
- Damaged valves increase blood pressure from the heart into the vein.
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