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Wiktionary
involuntary muscle

n. (context muscle English) Muscle that is not controlled by individual volition; cardiac muscle and smooth muscle.

WordNet
involuntary muscle

n. 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) [syn: smooth muscle]

Wikipedia
Involuntary muscle

Involuntary muscle may refer to:

  • Smooth muscle tissue
  • Cardiac muscle

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