Question

varicose veins occur when veins are unable to prevent backward flow of blood in places where high blood pressure occurs such as in the feet. this causes swelling of the veins and can be very painful. malfunctioning of which structural part of the veins lead to this condition?

Answer 1

Arteries carry blood from your heart to the rest of your tissues. Veins return blood from the rest of your body to your heart, so the blood can be recirculated. To return blood to your heart, the veins in your legs must work against gravity.
Muscle contractions in your lower legs act as pumps, and elastic vein walls help blood return to your heart. Tiny valves in your veins open as blood flows toward your heart then close to stop blood from flowing backward.