smooth muscle

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(involuntary muscle) muscle that produces slow long-term contractions of which the individual is unaware. Smooth muscle occurs in hollow organs, such as the stomach, intestine, blood vessels, and bladder. It consists of spindle-shaped cells within a network of connective tissue (see illustration) and is under the control of the autonomic nervous system. Compare striated muscle.

Smooth muscle cells.

Subjects: Medicine and Health — Chemistry.

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