頭髮一直也是不少人所關注的議題，而頭髮的生長，實情跟幹細胞(Stem cell)息息相關。530Please respect copyright.ＰＥＮＡＮＡOX9pdUxRox
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（圖2）頭髮的生長，是由位於髮囊底部名為hair-follicle stem cells (HFSCs)的幹細胞產生出來。530Please respect copyright.ＰＥＮＡＮＡ2u0zYZ73YW
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這些幹細胞會不斷地進行三個階段的循環，分別為anagen、catagen以及telogen。530Please respect copyright.ＰＥＮＡＮＡHxjxVpYKrv
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（圖3）當anagen發生的時候，HFSCs幹細胞就會開始進行自我複製，經一系列的程序後便會導致毛髮生長;這階段可持續進行數年。530Please respect copyright.ＰＥＮＡＮＡ4Hcuh7QJPr
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而當到達catagen的時候，毛髮便會停止生長，但依舊維持原位。530Please respect copyright.ＰＥＮＡＮＡ9wGWObptII
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之後便會進入telogan階段， HFSCs幹細胞進入「冬眠」狀態，不作任何複製舉動，而毛髮亦會因而自然地脫落。530Please respect copyright.ＰＥＮＡＮＡatdqsD6Wmv
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落入telogan階段後，幹細胞便會再度進入anagen階段，重新開始產生毛髮。530Please respect copyright.ＰＥＮＡＮＡ40F6uNMl9Z
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健康人士的HFSCs幹細胞，高達80-90%處於anagen，10-20%處於catagan，只有1-5%處於telogan階段。530Please respect copyright.ＰＥＮＡＮＡunHfFSemGg
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由此可以推想出，脫髮或者禿頭的原因就是大多數的HFSCs處於catagan或telogan階段，並不再重返anagen階段。530Please respect copyright.ＰＥＮＡＮＡqI7MCZqWKc
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下集將會講解為何壓力過大會導致脫髮，箇中的原理涉及荷爾蒙的改變，及幹細胞三階段的失衡。530Please respect copyright.ＰＥＮＡＮＡRK6GDvvK1S
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如果想我快啲出文的話，請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark，這對我非常之重要。530Please respect copyright.ＰＥＮＡＮＡkdwnifGhpw
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Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc530Please respect copyright.ＰＥＮＡＮＡfOKzKvKmiK
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同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」，以課金的方式推動我繼續搜羅資料寫文，多謝。530Please respect copyright.ＰＥＮＡＮＡqn85zyn9SP
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Link:530Please respect copyright.ＰＥＮＡＮＡhrX2R4uVz4
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio530Please respect copyright.ＰＥＮＡＮＡnud6kh1z4d
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除非Facebook及IG重開侵侵的account，否則我的IG將不會再作更新，只會寄居本土LIHKG及Penana。530Please respect copyright.ＰＥＮＡＮＡnjfCL1tCWT
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Ref1:https://pubmed.ncbi.nlm.nih.gov/26763421/530Please respect copyright.ＰＥＮＡＮＡ5Py88HvLTQ
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