the thickest blood vessels_______.
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Explanation:
Arteries and arterioles have thicker walls than veins and venules because they are closer to the heart and receive blood that is surging at a far greater pressure (Figure 2). Each type of vessel has a lumen—a hollow passageway through which blood flows.
Arterial blood flow and venous blood flow are connected by capillaries which are the smallest and thinnest blood vessels of the body. Capillaries also supply blood to the walls of blood vessels.