kapillaariseinää

Kapillaariseinää refers to the wall of a capillary, which are the smallest blood vessels in the body. These microscopic tubes are crucial for the exchange of oxygen, nutrients, and waste products between the blood and the body's tissues. The capillary wall is incredibly thin, typically only one cell thick, a feature that facilitates efficient diffusion. This single layer of endothelial cells forms the primary barrier of the capillary.

The structure of the capillary wall is adapted for its function. The endothelial cells are flattened and interconnected, with small gaps or fenestrations in some types of capillaries that allow for more rapid passage of certain substances. The basement membrane, a layer of extracellular matrix, surrounds the endothelial cells and provides structural support. This thin and permeable structure is essential for the vital process of microcirculation, enabling cells throughout the body to receive the necessary components for survival and function. Diseases or damage to the capillary walls can significantly impair this exchange, leading to various health issues.