What are the characteristics of capillaries in histology?
Capillaries are the smallest blood vessels, consisting of a single layer of endothelial cells surrounded by a basal lamina. This simple structure facilitates the efficient exchange of gases, nutrients, and waste products between the blood and surrounding tissues. Capillaries are classified into three types based on their permeability: continuous, fenestrated, and sinusoidal. Continuous capillaries have tight junctions between endothelial cells, limiting permeability. Fenestrated capillaries have small pores that increase permeability, while sinusoidal capillaries have larger gaps, allowing the passage of larger molecules and cells.
