Smooth-muscle cells are not attached to the skeleton, but are found in the walls of the ~blood~ vessels, the digestive tract, and in the |dermal layer| of the skin. They react slowly to stimuli from the autonomic nervous system and perform actions such as forcing food through the intestines, transporting urine to the |kidneys| and pumping ~blood~ through ~blood~ vessels. The muscle is nonstriated (lacks the striped appearance) and consist of spindle-shaped, uninuclear cells that are not bound together, as in skeletal muscle. Like skeletal muscle, |smooth muscle| has fibrillae but with out cross striations. The muscles are involuntary, and are slow-acting, untiring, and weak in action.
