Normal capillaries full Ilustración e icono

A schematic microanatomy illustration showing a dense capillary bed bridging an arteriole (A) and a venule (V), with interconnected lumina containing red blood cells (RBCs, erythrocytes). The red inflow indicates oxygenated arterial blood and the blue outflow indicates venous return, all embedded within surrounding parenchymal tissue cells. In the hierarchy of the circulatory system, these vessels represent the microcirculation within peripheral tissues. In anatomy and physiology, capillaries enable exchange of oxygen, carbon dioxide, nutrients, and metabolic waste across the endothelial barrier.