What Is the Main Function of Capillaries?

Capillaries function in a group, or a capillary bed, which is an interweaving network of capillaries. The more active a cell is the more capillaries that are needed to supply the proper blood flow and exchange of materials. These blood vessels are microscopic, but their presence is viewable at times. When a person blushes, this occurs in the capillaries and turns the cheeks red. This is partially possible because the wall of the artery is only one cell thick.