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A process in which force is generated within smooth muscle tissue, resulting in a change in muscle geometry. This process occurs in the fundus of stomach. Force generation involves a chemo-mechanical energy conversion step that is carried out by the actin/myosin complex activity, which generates force through ATP hydrolysis. The fundus is the portion of the stomach that lies above the cardiac notch. [GOC:mtg_muscle, MA:0001612]
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