体育锻炼能使骨骼肌粗壮有力,主要由于(    ) A.肌细胞数目增

体育锻炼能使骨骼肌粗壮有力,主要由于(   

A.肌细胞数目增多                

B.肌细胞分裂,生长速度加快

C.肌纤维逐渐变粗,肌纤维体积加大

D.肌纤维数目、体积都增加

答案

 C

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