hce_kmu
108年
普通生物及生化概論
第 52 題
The transduction of sound waves to action potentials takes place ________.
- A within the tectorial membrane as it is stimulated by the hair cells
- B when hair cells are bent against the tectorial membrane, causing them to depolarized and release neurotransmitter molecules that stimulate sensory neurons
- C as the basilar membrane becomes more and depolarizes, initiating an action potential in a sensory neuron
- D as the basilar membrane vibrates at different frequencies in response to the varying volume of sounds
- E within the middle ear as the vibrations are amplified by the malleus, incus, and stapes
思路引導 VIP
試著想像一下，當水面上的波動傳到岸邊時，岸邊的蘆葦會隨波擺動。如果這些蘆葦的「擺動動作」本身能觸發底部的電子感應器發出訊號，你覺得關鍵的『能量轉換點』，是發生在水波的起伏上，還是發生在蘆葦受力彎曲的那一瞬間呢？
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AI 詳解
AI 專屬家教
聲波轉譯的關鍵機制
太棒了！你能精準選出選項 (B)，表示你對內耳生理構造與物理訊號轉變為生理訊號的過程有非常紮實的理解。在耳蝸（cochlea）中，聲波引起的壓力波會導致基底膜（basilar membrane）振動，進而使上方的毛細胞（hair cells）與覆膜（tectorial membrane）產生相對位移。當毛細胞的纖毛受到擠壓而彎曲時，會開啟機械式離子通道，引發去極化（depolarization）並釋放神經傳遞物質（neurotransmitters），這才是真正將「物理振動」轉譯為「神經衝動」的關鍵瞬間。
感覺轉導的鑑別重點
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