involuntary muscle
involuntary muscle
| Noun | 1. |  involuntary muscle - a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart) |
| 单词 | involuntary muscle | |||
| 释义 | involuntary muscleinvoluntary muscle
involuntary muscleinvoluntary muscle[in′väl·ən‚ter·ē ′məs·əl]involuntary muscleinvoluntary muscleinvoluntary muscleSmooth muscle, usually within an organ or blood vessel, that contracts under the influence of unconscious processes mediated by the AUTONOMIC nervous system rather than by the conscious will.involuntary muscleorvisceral muscleorsmooth musclea type of muscle called ‘involuntary’ because it is innervated by the AUTONOMIC NERVOUS SYSTEM. It is also called ‘visceral’ as it is found in the alimentary canal, the blood vessels, CILIARY BODY, respiratory passages and URINOGENITAL SYSTEM. It is also called ‘smooth’ since the MYOFIBRILS lack striations. Involuntary muscle contracts slowly and takes a long time to fatigue. Compare STRIATED MUSCLE.involuntary muscle
Synonyms for involuntary muscle
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