Describe the Structure of Blood Vessels
Compared to arteries veins are thin-walled vessels with large and irregular lumens see Figure 207. Arteries have thick muscular walls which enable them to resist the pressure of blood flow. Pin On Anatomical Education The basic overall structure for veins and arteries is including the tunica intima they have an additional two tunics. . Blood is pumped from the heart in the arteries. Within each layer the amount of muscle and collagen fibrils varies depending on the size and location of the vessel. It is returned to the heart in the veins. The thick outermost layer of a vessel tunica adventitia or tunica externa is made of connective tissue. Veins vary slightly in structure according to their size. This allows it to control the blood flow to different areas of the body and withstand the high pressure of blood leaving the. This clot can potentially. Thus arterioles and venules have similar structures to thei...