Class-3 potassium channel blockers These agents block the potassium channels responsible for the repolarizing phase.

第三类是钾通道阻滞剂。这类药物阻断复极化时相的钾通道。

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。

Then, the cells repolarize, and start leaking again, and then the most leaky cells, in the pacemaker SA node, reach their threshold and fire first, re-setting the rhythm that keeps everyone in harmony so your heart functions properly.

然后，细胞重新极化，再次开始漏电，然后起搏器 SA 节点中漏电最多的细胞达到阈值，首先放电，重新设置节奏，让每个人都保持和谐，这样你的心脏功能就正常了。