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。588Please respect copyright.ＰＥＮＡＮＡIoJFjWHjhw
588Please respect copyright.ＰＥＮＡＮＡDgXAawQZgI
588Please respect copyright.ＰＥＮＡＮＡrENE7eVeHl
（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。588Please respect copyright.ＰＥＮＡＮＡrPSW2NKdnu
588Please respect copyright.ＰＥＮＡＮＡJL5uuYB13v
588Please respect copyright.ＰＥＮＡＮＡvsRIOprawS
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。588Please respect copyright.ＰＥＮＡＮＡSOoodICZJu
588Please respect copyright.ＰＥＮＡＮＡv5du8LLmdM
588Please respect copyright.ＰＥＮＡＮＡyBsuTvXiia
（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。588Please respect copyright.ＰＥＮＡＮＡbZTgiA8n09
588Please respect copyright.ＰＥＮＡＮＡF03GbQEDq2
588Please respect copyright.ＰＥＮＡＮＡXfxBErBHkj
而當到達catagen的時候，毛髮便會停止生長，但依舊維持原位。588Please respect copyright.ＰＥＮＡＮＡ56R8vccrPp
588Please respect copyright.ＰＥＮＡＮＡC2JIg7Pmsk
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。588Please respect copyright.ＰＥＮＡＮＡAndEU64k7C
588Please respect copyright.ＰＥＮＡＮＡkHQFrsHOUq
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。588Please respect copyright.ＰＥＮＡＮＡt1EGU4NQOh
588Please respect copyright.ＰＥＮＡＮＡ04MUwx4AcV
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。588Please respect copyright.ＰＥＮＡＮＡz1r0OUWmPS
588Please respect copyright.ＰＥＮＡＮＡH0QI7QA9R5
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。588Please respect copyright.ＰＥＮＡＮＡTLt83C1vzJ
588Please respect copyright.ＰＥＮＡＮＡJrUPxewQi3
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。588Please respect copyright.ＰＥＮＡＮＡeW9q7jMqCJ
588Please respect copyright.ＰＥＮＡＮＡZVhQBhrdHz
588Please respect copyright.ＰＥＮＡＮＡYJFkuuwufD
588Please respect copyright.ＰＥＮＡＮＡE53dilgxTS
588Please respect copyright.ＰＥＮＡＮＡkRYNjZF6EP
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。588Please respect copyright.ＰＥＮＡＮＡLzVioRX0l6
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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/toc588Please respect copyright.ＰＥＮＡＮＡnwCHluGMqs
588Please respect copyright.ＰＥＮＡＮＡjEh2vAj1Pl
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。588Please respect copyright.ＰＥＮＡＮＡXof6s8dwy8
588Please respect copyright.ＰＥＮＡＮＡ35DuguR4SQ
Link:588Please respect copyright.ＰＥＮＡＮＡ1OW0v9dGx6
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio588Please respect copyright.ＰＥＮＡＮＡUNM4eAUkgm
588Please respect copyright.ＰＥＮＡＮＡjtM6RI7ags
588Please respect copyright.ＰＥＮＡＮＡTS0nNKjy9P
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。588Please respect copyright.ＰＥＮＡＮＡOK8ibDVluZ
588Please respect copyright.ＰＥＮＡＮＡPBepXv63xy
Ref1:https://pubmed.ncbi.nlm.nih.gov/26763421/588Please respect copyright.ＰＥＮＡＮＡe1l6AQLcvm
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