Blood clots, or thrombosis, especially in the legs (DVT), pose serious health risks. Extended inactivity, trauma, medical ...

They occur when vein walls and valves are damaged, which can cause the blood that normally flows toward the heart to collect in the veins or even flow backward. This, in turn, can enlarge and distort ...

The blood in the veins of the legs works against gravity in order to return upwards to the heart. The blood is moved up towards the heart by one-way valves in the veins. When the leg muscles contract ...

It is used to remove a damaged vein and prevent complications of vein damage. If several valves in a vein and the vein itself are heavily damaged, the vein (or the diseased part of the vein) is ...

Instead of pushing the blood in one direction through the circulatory system, the valves may allow blood to flow back into the veins instead of toward the heart. This blood collects in the body.

They also use the movement of nearby muscles to move it along. The veins also have valves that keep blood from flowing backward and pooling in your arms and legs. When your blood doesn't move as ...

For example, a capillary is microscopically thin to allow gases to exchange, the arteries are tough and flexible to cope with high pressure blood flow and the veins contain valves to prevent the ...

In a normal leg with no varicose veins, valves which regulate blood flow from the leg upwards to the heart function normally and do not allow reverse flow of the blood into the leg. In case of ...

For example, a capillary is microscopically thin to allow gases to exchange, the arteries are tough and flexible to cope with high pressure blood flow and the veins contain valves to prevent the ...