This type will contract
without nervous stimulation although in most parts of the body its activity is
under the control of the autonomic (involuntary) nervous system. This variety
is composed of elongated spindle shaped muscle cells which retain the
appearance of a cell. Involuntary muscle is found in the coats of blood and
lymphatic vessels in the walls of digestive tract and the hollow viscera, trachea,
and bronchi, in the iris and ciliary muscle of the eye, and in the involuntary
muscles in the skin.
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