smooth muscle

smooth muscle defined in 1951 year

smooth muscle - smooth (plain, involuntary) muscle;
smooth muscle - Contractile tissue of vertebrates, consisting of numbers of individual elongated spindle-shaped cells, with no transverse striations (See also: Striped Muscle). bound together by connective tissue fibres. Found mainly in sheets surrounding hollow organs, e.g. blood-vessels, gut. Controlled by autonomic nervous system. Undergoes contraction rather slowly, and has marked power of maintaining certain degrees of contraction (tonus). Slow-contracting muscle of many invertebrates, e.g. molluscs, is rather similar.

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