A process in which force is generated within smooth muscle tissue, resulting in a change in muscle geometry. This process occurs in the vein. 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 vein is a vessel carrying blood away from the capillary beds. [GOC:mtg_muscle, MA:0000715, MSH:D014680]
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M5: Ontology GO: Gene Ontology GO:BP: GO Biological Process