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metal prints anatomical metal prints arterial metal prints arteries metal prints biological metal prints capillaries metal prints no-one metal prints nobody metal prints physiological metal prints vascular metal prints veins metal prints venous metal prints vessels metal prints white background metal prints capillary bed metal prints arteriovenous anastomosis metal prints

photographs anatomical photos arterial photos arteries photos biological photos capillaries photos no-one photos nobody photos physiological photos vascular photos veins photos venous photos vessels photos white background photos capillary bed photos arteriovenous anastomosis photos

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Capillary bed and arteriovenous anastomosis. Illustration of arteries (red, left) and veins (blue, right) connected by a capillary bed (top) and an arteriovenous anastomosis (bottom). The bands around the arterial blood vessels are smooth muscle bands that are known as precapillary sphincters. These tighten and relax to adjust blood flow into capillaries (a phenomenon known as precapillary resistance). This feature is mainly present in the mesenteric microcirculation in the intestines. The microvessels linking arterioles and capilaries in the microcirculation are known as metarterioles. The arteriovenous anastomosis is an alternative route for blood to flow between the arteries and veins, rather than flowing through the capillary bed.

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