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小動脈的管壁裡有平滑肌纖維，當收縮時小動脈的管腔就會變小，血液通過時阻力就會增大，人體要維持正常血流量，血壓也就上升;相反，在小動脈舒張時，血壓就會下降。血管壁平滑肌纖維的收縮和舒張是受內臟神經控制的，而內臟神經的活動則由大腦控制，並受內分泌腺的影響。
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