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Smooth muscle tissue is spindle shaped involuntary muscle, arranged in sheets or layers. There are usually two layers running together, these two layers alternately contract, changing the size of the organ, for example the biceps. Smooth Muscle differs from other types because it has no striations, cross-striped muscle fibers. It  is commonly found in hollow organs such as the stomach, the bladder, and the respiratory passages. Smooth muscles tissue's main function is to propel objects down a certain path.

Wavelike motions called peristalsis characterize smooth muscle. These motions are the smooth muscle sheets flexing and relaxing, thus altering the shape of the organ.