The ion channel known as the calcium channel exhibits selective permeability to calcium ions. Although there are ligand-gated calcium channels as well, it is sometimes referred to as a voltage-dependent calcium channel. Even though the concentration of Na+ outside of cells is 70 times higher than that of Ca2+, voltage-gated calcium (CaV) channels catalyze a rapid, highly selective influx of Ca2+ into cells. A side effect of some calcium channel blockers is that they slow your heart rate, which helps to lower blood pressure, treat angina, and regulate irregular heartbeats.
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