Diagram of microcirculation. This schematic diagram shows a metarteriole (initial segment of a thoroughfare channel) giving rise to capillaries. The precapillary sphincters of the arteriole and metarteriole control the entry of blood into the capillaries. The distal segment of the thoroughfare channel receives capillaries from the niicrocirculatory bed, but no sphincters are present where the afferent capillaries enter the thoroughfare channels. Blind-ending lymphatic vessels are shown in association with the capillary bed. Note the presence of anchoring filaments and the valve system within the lymphatic capillaries.
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