Actin and myoglobulin are the compositions building muscles' stretching function. Microtubulin is the basic substance wh肌动蛋白及肌球蛋白乃是构成肌肉伸缩机构的组成部分，微管蛋白是赋予鞭毛及纤毛能动的基本物质。
Flagellum (pl. flagella) A whiplike extension of prokaryote cells, with a basal body at its base, whose beat causes loco鞭毛：原核细胞的鞭状延长部分，基部有基体，当鞭毛进行挥鞭式运动时可以促使细胞移动。