Kapillärrekruttering

Kapillärrekruttering, also known as capillary recruitment, is a physiological process that occurs in the microvasculature, specifically in the capillaries of the body. It is a crucial mechanism for regulating blood flow and oxygen delivery to tissues. Capillary recruitment involves the opening of pre-existing capillaries or the formation of new ones in response to increased metabolic demand. This process is particularly important during exercise, when the body requires more oxygen and nutrients to meet the increased energy demands of muscles.

The recruitment of capillaries is mediated by various factors, including metabolic byproducts such as carbon dioxide and lactic acid, as well as hormones like angiotensin II and vasodilators like nitric oxide. These factors stimulate the dilation of precapillary sphincters, which are muscular structures that control the diameter of the capillaries. The dilation allows more blood to flow into the capillaries, increasing oxygen and nutrient delivery to the tissues.

Capillary recruitment is a dynamic process that can occur rapidly in response to changing physiological demands. It is an essential mechanism for maintaining tissue homeostasis and ensuring adequate oxygen and nutrient supply during periods of increased activity or stress. The process is tightly regulated to balance the need for increased blood flow with the body's overall metabolic and cardiovascular demands.