capillary endothelial cell post-arteriole capillary cell 2024-11-07T12:50:06Z An endothelial cell forming the walls of capillaries immediately downstream from arterioles, facilitating the exchange of substances between blood and interstitial fluid. This cell is characterized by a small diameter and may be continuous, fenestrated, or sinusoidal, depending on their location and function. This cell plays a crucial role in tissue oxygenation, nutrient delivery, and maintaining homeostasis within the microvascular network.