vlct0ria

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7+ Year Member
Jul 24, 2008
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smooth muscles are myogenic? and why if so?
As I remember, it is myogenic because the muscle is intrinsically regulated...ie, it can create action potentials within itself without being innervated.
 
Jun 14, 2009
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Mhm. Myogenic cells can contract without an outside neurogenic factor to initiate depolarization. Cardiac pacemaker cells do this with leaky channels that cause gradual depolarization. In smooth muscles there are mechanical Ca++ channels that open when the cells are stretched, initiating depolarization and action potentials.