Smooth muscle

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Smooth muscle is made up of cells with an elongated shape and has only one core, structured in several layers. Smooth muscle is controlled by the vagal system and contracts spontaneously and slowly via the action of two proteins: actin and myosin. Smooth muscle is located in the arteries, the gastrointestinal tract, and in the respiratory, urinary, and genital apparatuses. Smooth muscle serves to guarantee the transportation of various compounds, such as blood or air.