题目内容

神经纤维在静息时()。

A. 细胞膜外Na和K多于细胞膜内,而细胞内阴离子较多
B. 细胞膜通透性较低,而兴奋时通透性较高
C. 细胞膜对Na的通透性低,而对K通透性高
D. 细胞膜内外电位差的维持并不需要消耗ATP

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