不随意肌，拼音bù suí yì jī，是指没有意志参与的，即不随意活动的肌肉。
平滑肌不能由意志控制，所以又称为不随意肌。
Smooth muscle can not be controlled by the will, it is also called involuntary muscle.
少数病人抗核抗体及抗不随意肌抗体可为阳性，但抗线粒体抗体阴性，这可与原发性胆汁性肝硬化区别。
A small number of patients possess positive anti-nuclear antibody and anti-smooth muscle antibody and negative anti-mitochondrial antibody, which can be distinguished from primary biliary cirrhosis.
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