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<p>channels.</p>

<p><big>Types</big></p>
<p>There are four major classes of potassium channels:</p>

<p>
*<a href="page.php?w=Calcium-activated_potassium_channel">Calcium-activated potassium channel</a>open in response to the presence of <a href="page.php?w=calcium">calcium</a> ions or other signalling molecules.<br/>
*<a href="page.php?w=Inward-rectifier_potassium_ion_channel">Inwardly rectifying potassium channel</a>passes current (positive charge) more easily in the inward direction (into the cell).<br/>
*<a href="page.php?w=Tandem_pore_domain_potassium_channel">Tandem pore domain potassium channel</a>are</p><p>
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