单选题-单选 适中0.65 引用43 组卷143
如图所示,神经纤维MB段距离长于MC段,在M处施以电刺激,在B、C处用电流计测其电位变化,电流计指针( )
![](https://img.xkw.com/dksih/QBM/2021/2/4/2650943668281344/2662341210308608/STEM/7a44e871-c9bd-4f26-952a-43eb1d1a4deb.png)
![](https://img.xkw.com/dksih/QBM/2021/2/4/2650943668281344/2662341210308608/STEM/7a44e871-c9bd-4f26-952a-43eb1d1a4deb.png)
A.不动 | B.向左摆 |
C.向右摆 | D.发生两次方向相反的 |
9-10高二下·安徽蚌埠·期中
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图为一能测出神经元表面电位变化的灵敏电流计,反射弧上a、b、c、d四点等距。下列叙述不正确的是( )
![](https://img.xkw.com/dksih/QBM/2016/3/24/1567085904691200/1567085907468288/STEM/14cbc11ca8284788914b4fe895a87afa.png)
![](https://img.xkw.com/dksih/QBM/2016/3/24/1567085904691200/1567085907468288/STEM/14cbc11ca8284788914b4fe895a87afa.png)
A.电流计连于b、c处,在a处给与刺激,指针会发生两次方向相反的偏转 |
B.电流计连于b、d处,在c处给与刺激,指针将不偏转 |
C.电流计连于a、c处,在b处给与刺激,指针将不偏转 |
D.电流计连于b、c处,在d处给与刺激,指针将不偏转 |
如图,在神经纤维上有A、B、C、D 4个点,且AB=BC=CD,现将一个电流计连接到神经纤维细胞膜的表面AB之间,若在C处给一强刺激,其中电流计指针的偏转情况是( )
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897106046164992/2898744701886464/STEM/b4053d489daa4c5da4997d83a173fa79.png?resizew=136)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897106046164992/2898744701886464/STEM/b4053d489daa4c5da4997d83a173fa79.png?resizew=136)
A.偏转一次,方向向左 | B.偏转一次,方向向右 |
C.偏转两次,方向相反 | D.偏转两次,方向相同 |
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