Question

2．反射弧的組成包括五個(gè)部分，按神經(jīng)沖動(dòng)傳導(dǎo)的順序，應(yīng)是（　�。�

• A． 感受器→傳入神經(jīng)纖維→神經(jīng)中樞→傳出神經(jīng)纖維→效應(yīng)器
• B． 效應(yīng)器→傳入神經(jīng)纖維→神經(jīng)中樞→傳出神經(jīng)纖維→感受器
• C． 神經(jīng)中樞→感受器→傳入神經(jīng)纖維→傳出神經(jīng)纖維→效應(yīng)器
• D． 感受器→傳入神經(jīng)纖維→效應(yīng)器→傳出神經(jīng)纖維→神經(jīng)中樞

Answer 1

分析 反射弧的五個(gè)組成部分依次是：感受器、傳入神經(jīng)（感覺神經(jīng)）、神經(jīng)中樞、傳出神經(jīng)（運(yùn)動(dòng)神經(jīng)）和效應(yīng)器．反射弧必須完整才能完成反射，缺少任何一個(gè)環(huán)節(jié)反射活動(dòng)都不能完成．

解答 解：神經(jīng)調(diào)節(jié)的基本方式是反射，完成反射的神經(jīng)結(jié)構(gòu)是反射弧．括感受器、傳入神經(jīng)、神經(jīng)中樞、傳出神經(jīng)和效應(yīng)器．神經(jīng)沖動(dòng)的傳導(dǎo)途徑是感受器→傳入神經(jīng)→神經(jīng)中樞→傳出神經(jīng)→效應(yīng)器．
故選：A

點(diǎn)評(píng) 解答此類題目的關(guān)鍵是理解熟記反射弧的結(jié)構(gòu)．