Normal...: The sequence of events in voiding is chiefly a process of perfectly coherent automation of involuntary smooth muscles and autonomic nerve system, which cannot be suppressed as voluntary striated muscles, although striated muscles contribute a great role of external sphincter. Once, the involuntary smooth muscle (detrusor) of bladder starts to contract to squeeze urine out, we cannot stop it.
Answered 9/29/2016
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