Question

膝跳反射發(fā)生的順序是
①扣打的刺激使股四頭肌的肌腱和肌肉內(nèi)的感受器產(chǎn)生神經(jīng)沖動(dòng)
②膝跳反射的中樞發(fā)出神經(jīng)沖動(dòng)
③傳人神經(jīng)元將神經(jīng)沖動(dòng)傳到脊髓灰質(zhì)里的膝跳反射中樞
④引起大腿上相應(yīng)的肌肉收縮，使小腿前伸
⑤傳出神經(jīng)元將神經(jīng)沖動(dòng)傳到效應(yīng)器

1. A.
   ①→②→④→⑤→③
2. B.
   ①→④→③→②→⑤
3. C.
   ①→③→②→⑤→④
4. D.
   =1 \* GB3 ①→④→②→③→⑤

Answer 1

C
此題考查對(duì)神經(jīng)沖動(dòng)在反射弧中傳導(dǎo)途徑的掌握。神經(jīng)沖動(dòng)在反射弧上傳導(dǎo)的順序是：感受器接受刺激產(chǎn)生神經(jīng)沖動(dòng)，神經(jīng)沖動(dòng)沿傳人神經(jīng)元傳到神經(jīng)中樞，神經(jīng)中樞把神經(jīng)沖動(dòng)沿傳出神經(jīng)元傳導(dǎo)到效應(yīng)器，引起大腿相應(yīng)肌肉的收縮，結(jié)果產(chǎn)生了運(yùn)動(dòng)，表現(xiàn)為小腿前伸。