The myocardial cell is enclosed by the sarcolemma . 心肌细胞由肌膜包裹。
2.
It is well established that the cardiac contraction is initiated when an 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。
3.
Each cell in this type of muscle has associated with it a nerve ending that is deeply embedded the sarcolemma . 这种肌肉里的每一个细胞都伴随有一个深深嵌入肉膜的神经末梢。
4.
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。
5.
Elevation of intracellular calcium ions may be partly induced by increased influx through sarcolemma l type - calcium channels . intracellular calcium elevation , on one hand , would activate calpain , a calcium - dependent cysteine protease that degrade the myofibrillar proteins and cause muscle atrophy ; on the other hand , result in activation of calcineurin which enhance the activity of mhc i promoter and inhibit a shift of mhc isoforms from slow to fast in soleus 这样，可能使得萎缩比目鱼肌细胞内钙离子水平升高，细胞内钙离子静息浓度的增加一方面激活calpain ，增加收缩蛋白的降解，使肌肉萎缩；草四军医大月卜祠成士学位论文另一方面通过激活钙调神经磷酸酶，增加快型mhc基因的表达，使骨骼肌肌球蛋白重链( mhc )发生由慢型向快型的转化。
