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Ralph asked in 科學生物學 · 10 years ago

Sensory and Motor Mechanisms的題

The transduction of sound waves into 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 depolarize and

release neurotransmitter that stimulates sensory neurons.

(C)as the basilar membrane becomes more permeable to sodium ions 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.

答案是E嗎?

我完全看不懂

請翻譯並解釋題目及選項

謝謝

Update:

B哪裡錯

C又為什麼對

可否做詳細解釋

1 Answer

Rating
  • gogogo
    Lv 6
    10 years ago
    Favorite Answer

    聲音的傳導轉變成動作電位發生在甚麼地方 :

    (A)當毛細胞(hair cells)產生刺激時在耳蝸內膜(tectorial membrane)產生動作電位

    (B)當毛細胞(hair cells)刺激時耳蝸內膜(tectorial membrane)時,造成去極化,並釋出刺激神經細胞的神經傳導物質

    (C)當基膜(basilar membrane)對鈉離子的通透度增加造成去極化,啟動感覺神經的動作電位

    (D)因應不同程度聲音時,基膜(basilar membrane)產生不同頻率的震動

    (E)在內耳中,被錐骨(malleus)、砧骨(incus)和鐙骨(stapes)放大

    正確答案是(C),機械性的震動改變了鈉離子通道,因而引發去極化反應,引起動作電位

    2010-06-22 22:57:52 補充:

    謝謝!! 答案是B

    正確過程如下:

    Hair cell 以機械式的型態改變正離子(以鉀和鈣為主)的通性,大量正離子由endolymph湧入而使hair cell去極化,產生receptor potential,進而開啟鈣離子通道,大量鈣離子湧入細胞而使神經傳遞物質釋出,當這些神經傳遞物質傳到神經細胞的細胞膜並與receptor結合,便使神經細胞開始產生動作電位。

    答案是B,謝謝!!

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