involuntary muscle

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involuntary muscle

[in′väl·ən‚ter·ē ′məs·əl]
(physiology)
Muscle not under the control of the will; usually consists of smooth muscle tissue and lies within a vescus, or is associated with skin.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The walls of these tubes and sacs contain involuntary muscles that squeeze the organs and move things (food, liquids, a baby during childbirth and so forth) through them.
Involuntary muscles are not affected, and the voluntary muscles that move the eyes usually aren't affected.
Recent research in animals suggests that some forms of LGMD may affect the involuntary muscles responsible for normal blood vessel contraction and relaxation, and that this involvement could be a factor in some of the heart problems occasionally seen in LGMD.

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