Venous muscle pump
The illustration shows a venous system, consisting of two veins and their connecting veins. Each right vein is the superficial one, connected to the deep vein (on the left) via so-called perforator veins. The muscle pump of the leg is the most important structure for the return transport of the blood. The muscles contract due to movement of the leg, and press the venous blood upwards, against the force of gravity, back to the heart.
