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muscle. most smooth muscle is of the single-unit variety, that is, either the whole muscle contracts or the whole muscle relaxes, but there is multiunit smooth muscle in the trachea , the large elastic arteries, and the iris of the eye. single unit smooth muscle, however, is most common and lines blood
autonomic nervous system ). smooth muscle in various regions of the vascular tree, the airway and lungs, kidneys and vagina is different in their expression of ionic channels, hormone receptors, cell-signaling pathways, and other proteins that determine function. external substances[ edit ] for instance, blood...
https://en.wikipedia.org/wiki/Smooth_muscle