What are the capillaries of the vascular system?
Capillaries are small blood vessels that perform exchange of substances among the blood and the body tissues. Capillaries are neither arteries nor are they veins as they have distinct features. In capillaries the wall is made of a single layer of endothelial cells by which substances are exchanged. These vessels receive blood from the arterioles and drain to the venules.
The Circulatory System - Image Diversity: blood capillaries