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<p>by both voltage and ligands to provide precise control over ion flow. Some cation channels allow calcium as well as other cations to pass through the membrane.</p>

<p>Calcium channels can participate in the creation of <a href="page.php?w=Action_potential">action potentials</a> across cell membranes. Calcium channels can also be used to release calcium ions as <a href="page.php?w=Second_messenger_system">second messengers</a> within the cell, affecting downstream signaling pathways.</p>

<p><big>Comparison tables</big></p>
<p>The following tables explain</p><p>
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