As potassium levels decrease in the extracellular space, the magnitude of the potassium gradient across the cell membrane is increased causing hyperpolarization.

随着细胞外钾离子浓度降低，细胞膜上钾离子梯度增加，导致超极化。

This is because hyperpolarization enhances the funny currents in cardiac pacemaker cells resulting in a faster phase 4 depolarization and thus a faster heart rate.

这是因为超极化会增强心脏起搏细胞中的funny电流，导致更快的4相去极化，从而加快心率。