When voltage-gated sodium channels open due to the depolarization of a neuron or axon, which of the statements below best describes why sodium ions enter the neuron? 当神经元或轴突去极化导致电压门控钠通道打开时，下列哪项陈述最能描述钠离子进入神经元的原因？单项选择题

A

There are more negatively charged ions inside than outside 内部带负电荷的离子比外部多。

B

There is more sodium outside the neurons than inside (a concentration gradient) 神经元外部的钠离子浓度高于内部（存在浓度梯度）。

C

The combination of the concentration and the relative negative potential inside the neuron. 神经元内部浓度和相对负电位的结合。

D

The balance of sodium and chloride inside the cell is greater than that ratio outside the neuron. 细胞内钠氯比例高于神经元外钠氯比例。

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