En, as in skeletal muscle and neurons, voltage-regulated potassium channels open and allow potassium to rush to the ECF.
The membrane is repolarized by potassium moving to the ECF, which lowers the SA node cells' potential to -60 mV.
The most common type of ion channel present in almost all organisms is the potassium channel. They build holes across cell membranes that are selective for potassium. The majority of cell types contain potassium channels, which regulate a wide range of cellular activities.
The four primary categories of potassium channels are as follows: voltage-gated, tandem pore domain, inwardly rectifying, and calcium triggered. While the construction of these channels is similar, the distinctions between these types primarily relate to how the gate receives its signal.
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