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<p>Animal cells actively pump sodium ions out of the cells by means of the <a href="page.php?w=sodium-potassium_pump">sodium-potassium pump</a>, an <a href="page.php?w=enzyme">enzyme</a> complex embedded in the <a href="page.php?w=cell_membrane">cell membrane</a>, in order to maintain a roughly ten-times higher concentration of sodium ions outside the cell than inside. In <a href="page.php?w=Neuron">nerve cells</a>, the sudden flow of sodium ions into the cell through <a href="page.php?w=voltage-gated_sodium_channel">voltage-gated sodium channel</a>s</p><p>
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