A negative regulation of smooth muscle contraction resulting in relaxation of vascular smooth muscle. The relaxation is mediated by a decrease in the phosphorylation state of myosin light chain. This can be achieved by removal of calcium from the cytoplasm to the sarcoplasmic reticulum lumen through the action of Ca2+ ATPases leading to a decrease myosin light chain kinase activity, and through calcium-independent pathways leading to a increase in myosin light chain phosphatase activity. [GO_REF:0000058, GOC:BHF, GOC:BHF_miRNA, GOC:dph, GOC:rph, GOC:TermGenie, PMID:15867178, PMID:19996365, PMID:27389411]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process
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