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Factors that are responsible for depolarizing the GIT smooth muscles are:
1 stretching of the muscle
2 stimulation by acetylcholine
3 stimulation by parasympathetic nerves that secrete acetylcholine at their endings 
4 stimulation by several specific gastrointestinal hormones.
But i must say u asked a very good question.
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Due to some stress  depolarization occurs in GIT smooth muscle
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