第四节 骨骼肌旳收缩功能The contraction function of skeletal muscle
一、骨骼肌细胞收缩活动旳引起和收缩机制    The initiation of skeletal muscle cell contraction     and contraction mechanism
（一）神经-肌肉接头处旳兴奋传递      The excitable transmission of       neuromuscular junction