This illustration presents transverse sections of different blood vessels: an artery, a vein, and the vena cava. Key vascular layers are labeled, including the tunica intima, tunica media, and tunica adventitia (externa), along with features like elastic laminae, collagen fibers, and the vasa vasorum. These histological details highlight the structural differences that reflect the distinct functions and pressure tolerances of arteries and veins.

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