Veenisüsteem

Veenisüsteem refers to the venous system, which is a network of blood vessels responsible for returning deoxygenated blood from the body's tissues back to the heart. This system works in conjunction with the arterial system, which carries oxygenated blood away from the heart.

The venous system includes veins, venules, and their valves. Veins are generally larger and thinner-walled than arteries. Venules are smaller vessels that collect blood from capillaries and merge to form veins. Many veins, particularly in the limbs, contain one-way valves that prevent the backflow of blood, ensuring it continues to move towards the heart, often against gravity.

Blood flow in the venous system is driven by several factors, including the contraction of skeletal muscles that squeeze the veins, pressure changes in the thoracic cavity during breathing, and the residual pressure from arterial circulation.

Disruptions to the venous system can lead to various medical conditions. Varicose veins, characterized by swollen, twisted veins, occur when valves become weakened or damaged, causing blood to pool. Deep vein thrombosis (DVT) is a serious condition where a blood clot forms in a deep vein, which can potentially dislodge and travel to the lungs, causing a pulmonary embolism.

The health of the venous system is crucial for maintaining proper circulation and delivering oxygen and nutrients to all parts of the body. Lifestyle factors such as regular exercise, maintaining a healthy weight, and avoiding prolonged periods of sitting or standing can contribute to good venous health.