The stress fibers (SF) are the contractile apparatus of VSMC, which is composed of microfilament bundles and myosin filaments (thick myofilaments).
由微丝聚集成束，再与肌球蛋白纤维（粗肌丝）结合共同组成细胞收缩装置——应力纤维。
参考来源 - 血管平滑肌细胞SM22α的表达调节及其功能研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Myofilaments were found in cytoplasm, and between cells there were cell junctions.
胞浆内可见肌丝样结构，细胞间存在细胞连接。
Transmission electron microscopy showed that the induced cells had myofilaments, Z line-like substances.
透射电镜可见平行排列的肌丝、Z线样物质。
Allopurinol can enhance cardiac function by improving unbalanced distribution of calcium, increase the sensitivity of myofilaments to calcium and improving abnormal excitation contraction coupling.
别嘌呤醇的强心作用在于它不但能够改善心衰心肌钙分布的不平衡状态，而且能够增加肌丝蛋白对钙的敏感性，改善异常的兴奋收缩耦联。
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