Blood vessels, light micrograph

Blood vessels, light micrograph

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Credit: MICROSCAPE/SCIENCE PHOTO LIBRARY

Caption: Light microscopy of an artery (left) and vein (right). For comparable physical size the artery shows a far thicker wall compared with the vein. The arterial wall is comprised of smooth muscle and elastic fibres (black/indigo wavy lines) that serve to control blood pressure and flow via vessel constriction and relaxation/elastic recoil. In contrast, veins function as reservoirs holding blood with capacity for expansion and elasticity but limited contractile properties hence a scarcity of smooth muscle in the smaller-sized veins. Magnification x180 when printed at 10 cm.

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Keywords: arterial, artery, biological, biology, blood vessel, circulation, circulatory system, elastic fibres, elastin, healthy, histological, histology, light micrograph, light microscopy, normal, section, smooth muscle, vascular, vascular system, vein, venous, vessel

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