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The nonstriated muscle is found in the walls of the hollow viscera internal organssuch as Bio Notes canal, genital tract, ducts, blood vessels, urinary bladder, etc. Hence, it is often called visceral muscle also. It also occurs in the iris and ciliary body of the eye and dermis of the skin.
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The smooth muscle consists of long, narrow, spindle-shaped fibres that are generally shorter than the striated muscle fibres. Their average length is about 0.
The myofibrils are noticeable with difficulty. They are composed of myosin Bio Notes actin, and need energy from ATP for contraction. The cross-striations are absent so that the fibres look smooth, hence the names nonstrated, unstriped or smooth. The smooth muscle fibres lack T-tubules, have less extensive sarcoplasmic reticulum and less numerous mitochondria and other organelles than the striated muscle fibres.
The adjacent Bio Notes muscle fibres are joined through gap junctions for the propagation of action potential. The visceral muscle contracts slowly, but can remain contracted for a long time without getting fatigued. It relaxes also equally slowly.
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It is innervated by nerves principally from the autonomic nervous system. Its contraction is not under the control of the animal. It is, therefore, also called the involuntary muscle. The visceral muscle fibres Bio Notes usually arranged in the form of continuous sheets composed of many layers of fibres.
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In the walls of the hollow organs, they often occur in 2 main layers:. The smooth muscle fibres may also occur individually as in the villi of the small intestine or in the form of bundles surrounded by a connective tissue sheath, e. The blood supply of the smooth muscle is scanty as Notea to that of the striated Bio Notes.
Blood capillaries lie on the surface of the fibres. The general function of the smooth muscle is to make the organs short and thick by its contraction or long and thin by its relaxation. Types : Functionally, the smooth muscle is of two types : single unit Bio Notes multiunit.]
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