This concentration gradient is extremely important for setting the resting membrane potential of excitable cell membranes, which is needed for normal contraction of smooth, cardiac, and skeletal muscle.

电化学梯度在可兴奋细胞膜静息电位的形成中十分重要，而平滑肌，心肌还有骨骼肌的收缩都需要可兴奋细胞膜的参与。

But eventually, the resting membrane potential gets so high that it's above the threshold potential, meaning that once the muscle depolarizes and contracts, it can't repolarize to allow another contraction.

但最终，静息电位变得太高，以至于超过阈值点位，这意味着一旦肌肉去极化收缩，就不能复极化以进行下一次收缩了。

As potassium levels INcrease in the EXTRAcellular space, the MAGNITUDE of potassium gradient across the cell membrane is REDUCED, and so is the ABSOLUTE value of the resting membrane potential.

随着细胞外钾离子浓度增加，跨细胞膜上钾离子梯度减小，静息膜电位的绝对值也减小。