laskimojärjestelmien

Laskimojärjestelmät, or venous systems, refer to the network of veins in the body responsible for returning deoxygenated blood from the tissues back to the heart. Unlike arteries, which carry oxygenated blood away from the heart under high pressure, veins operate at much lower pressures and often contain valves to prevent the backflow of blood. These valves are crucial, especially in the limbs, where gravity works against the direction of blood flow.

The venous system is divided into superficial and deep veins. Superficial veins are located closer to the skin's surface and are often visible. Deep veins run alongside arteries and are typically larger and more important for the bulk return of blood. The two major venous systems are the superior vena cava, which collects blood from the upper body, and the inferior vena cava, which collects blood from the lower body. Both empty into the right atrium of the heart.

Disruptions in the venous system can lead to various medical conditions. Varicose veins, for instance, occur when veins become enlarged and twisted, often due to faulty valves. Deep vein thrombosis (DVT) is a serious condition where a blood clot forms in a deep vein, potentially leading to a pulmonary embolism if the clot travels to the lungs. Maintaining good circulation through regular exercise and avoiding prolonged sitting or standing can help promote healthy venous function.