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。565Please respect copyright.ＰＥＮＡＮＡzWNzsZTOYU
565Please respect copyright.ＰＥＮＡＮＡx6B5Zn1Brl
565Please respect copyright.ＰＥＮＡＮＡkDd8iXBeiY
（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。565Please respect copyright.ＰＥＮＡＮＡ9Sb8bnaeCh
565Please respect copyright.ＰＥＮＡＮＡdRoegR3USQ
565Please respect copyright.ＰＥＮＡＮＡQJRv0A6KPU
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。565Please respect copyright.ＰＥＮＡＮＡpQ9m2efypo
565Please respect copyright.ＰＥＮＡＮＡzist8fZF8D
565Please respect copyright.ＰＥＮＡＮＡyOGHbIlbhl
（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。565Please respect copyright.ＰＥＮＡＮＡrzUixqBzti
565Please respect copyright.ＰＥＮＡＮＡXhn90dlrEM
565Please respect copyright.ＰＥＮＡＮＡUxheIEQdSj
而當到達catagen的時候，毛髮便會停止生長，但依舊維持原位。565Please respect copyright.ＰＥＮＡＮＡmBKZMypZKN
565Please respect copyright.ＰＥＮＡＮＡe5tp0dXYUc
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。565Please respect copyright.ＰＥＮＡＮＡqOczRvQ3YU
565Please respect copyright.ＰＥＮＡＮＡBSEd59TCwl
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。565Please respect copyright.ＰＥＮＡＮＡUMs8MsxkMA
565Please respect copyright.ＰＥＮＡＮＡX8xljmErzG
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。565Please respect copyright.ＰＥＮＡＮＡTE6CSoEWgJ
565Please respect copyright.ＰＥＮＡＮＡ15ZEJ4V5Wp
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。565Please respect copyright.ＰＥＮＡＮＡqA7CK5pYQ9
565Please respect copyright.ＰＥＮＡＮＡtRd0asUJ02
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。565Please respect copyright.ＰＥＮＡＮＡr9kPwDCe2N
565Please respect copyright.ＰＥＮＡＮＡGOAW1MosYk
565Please respect copyright.ＰＥＮＡＮＡ2kXkBae84h
565Please respect copyright.ＰＥＮＡＮＡxWB09Vsj7Q
565Please respect copyright.ＰＥＮＡＮＡWK2b9ie6ch
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。565Please respect copyright.ＰＥＮＡＮＡcfOYa2p4DJ
565Please respect copyright.ＰＥＮＡＮＡI5RKYvF7ks
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/toc565Please respect copyright.ＰＥＮＡＮＡWBFlzZgY0E
565Please respect copyright.ＰＥＮＡＮＡcXhteq7fKI
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。565Please respect copyright.ＰＥＮＡＮＡoeNj3EzYL2
565Please respect copyright.ＰＥＮＡＮＡN1yJd0CnY2
Link:565Please respect copyright.ＰＥＮＡＮＡX34n4u8zNx
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio565Please respect copyright.ＰＥＮＡＮＡsKd6rUBeYj
565Please respect copyright.ＰＥＮＡＮＡSxQAqFqBmg
565Please respect copyright.ＰＥＮＡＮＡz3BcUvBrEo
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。565Please respect copyright.ＰＥＮＡＮＡg3k9XCnZrh
565Please respect copyright.ＰＥＮＡＮＡlcCOocQQGd
Ref1:https://pubmed.ncbi.nlm.nih.gov/26763421/565Please respect copyright.ＰＥＮＡＮＡFO5DCoZKD8
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