It is well established that the cardial contraction is initiated when action potential depolarizes the sarcolemma.
已经确证,心肌收缩始于动作电位使肌膜去极化.
The myocardial cell is enclosed by the sarcolemma.
心肌细胞由肌膜包裹.
The sarcolemma, about 7.5 nm thick , is a unit-membrane like that investing other cells.
肌纤维膜厚约7.5毫微米,同包裹着其它细胞的壁一样, 是一层单位膜.
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