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头发与油

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头发上的油脂来自哪里？原来毛囊的上部与皮脂腺相接，它分泌的皮脂滋润着头皮和头发，如“天然”屏障一般起到保护作用。每个人的头发都不断地得到由毛囊皮脂腺产生的天然油性物质——皮脂的滋润。皮脂从毛囊开始顺着头发向上扩散，但皮脂并不被头发所吸收。皮脂腺能产生多少皮脂主要是由人的遗传基因所决定的。一般来说，青少年时期激素水平较高，皮脂腺产生的皮脂大量增多，这就是青少年会有油性头发倾向的原因。皮脂腺的分泌会随着年龄的增大逐渐减少。
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