用图甲装置测量神经元膜电位,测得的膜电位变化如图乙所示,据此

用图甲装置测量神经元膜电位,测得的膜电位变化如图乙所示,据此判断下列叙述正确的是              (  )

A.图乙显示的是膜内电位

B.钠离子大量内流发生在cd

Cab段为动作电位

D.将图甲中刺激点移至X处,显示的膜电位变化幅度相同

答案

 神经细胞膜上,静息电位为内负外正,因此图乙显示的是膜外电位,A错;钠离子大量内流时,使膜外电位迅速下降,应对应bc段,B错;ab段应为静息电位,C错;将图甲中刺激点移到X处,显示的膜电位变化幅度相同,D正确。

答案 D

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