一碗同等糖份的紅豆沙，如果將熱紅豆沙和凍紅豆沙比較的話，熱紅豆沙感覺起上來總是會比較甜，究竟為何會這樣呢？1584Please respect copyright.ＰＥＮＡＮＡqgthrbAKxc
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答案就在於舌頭上的味蕾感測機制之上。1584Please respect copyright.ＰＥＮＡＮＡ2RnYXLSyYq
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（圖2）我們的舌頭上佈滿味蕾細胞，主要功能是為我們感測食物的味道。1584Please respect copyright.ＰＥＮＡＮＡFrew9V6cV0
以感測甜味為例，以下為扼要的簡化過程。1584Please respect copyright.ＰＥＮＡＮＡbIiFI66E9T
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1.甜味物質與味蕾上的T1R2及T1R3合併。1584Please respect copyright.ＰＥＮＡＮＡhU7ELezNW8
(Type1 Taste Receptor member 2 and 3)1584Please respect copyright.ＰＥＮＡＮＡ8m5JRi8qXu
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2.其後觸發一系列的細胞反應，並產生出鈣離子(Ca2+ ion)。1584Please respect copyright.ＰＥＮＡＮＡlT6wLX6wu0
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3. 鈣離子觸動TRPM5，產生電流。1584Please respect copyright.ＰＥＮＡＮＡkHccsujQNk
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4. 電流經由神經細胞傳到大腦。1584Please respect copyright.ＰＥＮＡＮＡa129a1DZdY
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5. 大腦分析電流訊息，製造甜味的感覺。1584Please respect copyright.ＰＥＮＡＮＡPz48xHftDR
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（圖3）那麼，為何熱紅豆沙會比較甜呢？玄機就在圖中機制的第三步。1584Please respect copyright.ＰＥＮＡＮＡqGvJblecJv
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TRPM5除了能夠感測鈣離子後，亦能感測溫度。1584Please respect copyright.ＰＥＮＡＮＡiHjVNeK946
若然食物溫度提升的話，TRPM5所發出的電流強度便會有所增長。1584Please respect copyright.ＰＥＮＡＮＡyIPna38PbJ
而電流越強的話，大腦便會轉遞出越甜的感覺。1584Please respect copyright.ＰＥＮＡＮＡcdYOjS0s1z
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而正正就是因為這個緣故，儘管糖份一樣，熱紅豆沙食起上來會比凍紅豆沙感覺起上來會比較甜。1584Please respect copyright.ＰＥＮＡＮＡyeXD6ZtbNb
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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。1584Please respect copyright.ＰＥＮＡＮＡx8YbdDBmS4
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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/toc1584Please respect copyright.ＰＥＮＡＮＡQPGqBisRh5
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Link:1584Please respect copyright.ＰＥＮＡＮＡ71BYTDYJHj
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1584Please respect copyright.ＰＥＮＡＮＡrkkccLrbyr
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。1584Please respect copyright.ＰＥＮＡＮＡePmSHi83AJ
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