A large portion of the cytoskeleton consists of threadlike microfilaments composed mainly of the contractile actin.
细胞骨架大部分由微丝组成，微丝主要由可收缩的肌动蛋白组成。
Fatigue occurs when the interval of intermittent tetanic contraction of skeletal muscle is shortened to a certain degree and the contractile tension declines.
骨骼肌间断强直收缩期间，当刺激间隔缩短到一定程度时，收缩张力呈现逐步降低，即产生疲劳现象。
Regional left ventricular contractile dysfunction induced by ischemia is associated with less thickening of regional wall and a larger ventricular radius at end-systole.
心肌缺血引起局部左室收缩功能减低常伴有心室内径增大和局部室壁变薄。
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