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A resistance artery is small diameter blood vessel in the microcirculation that contributes significantly to the creation of the resistance to flow and regulation of the blood flow. Resistance arteries are usually arterioles or end-points of arteries. Having thick muscular walls and narrow lumen they contribute the most to the resistance to blood flow. Degree of the contraction of muscles in the wall of a resistance artery is directly connected to the size of the lumen. == Definition == Functionally from physiological point of view blood vessels can be divided in several categories * Buffer vessels – aorta, middle-sized arteries * Resistance vessels – arterioles, pre- and postcapillaries. * Metabolic vessels – capillaries * Capacitance vessels – veins Particular feature of resistance vessels is ability to change lumen crossectional area and influence the blood pressure. Human arteries or arterioles that are around 0.2 mm or smaller contribute to creation of the blood flow resistance and are called resistance arteries. 〔Cardiovascular Physiology By William R. Milnor〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Resistance artery」の詳細全文を読む スポンサード リンク
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