In smooth muscle cells that can produce action potentials,cell membrane depolarization usually opens voltage-sensitive sodium channels.

Name: In smooth muscle cells that can produce action potentials,cell membrane depolarization usually opens voltage-sensitive sodium channels.
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In smooth muscle cells that can produce action potentials, cell membrane depolarization usually opens voltage-sensitive calcium channels, not sodium channels, leading to an influx of calcium ions which initiates contraction.

In Smooth Muscle Cells That Can Produce Action Potentials,cell Membrane