All are true for blood vessels except:

A The arteries are thick-walled structures with extensive development of elastic tissue, smooth muscle, and connective tissue.
B Arterioles are the site of least resistance to blood flow.
C The capillaries are thin-walled structures lined with a single layer of endothelial cells, which is surrounded by a basal lamina.
D The volume of blood contained in the veins is called the unstressed volume.

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