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230问答网 > 肱二头肌和肱三头肌是怎样形成伸肘和屈肘运动的

肱二头肌和肱三头肌是怎样形成伸肘和屈肘运动的

肱二头肌和肱三头肌是怎样形成伸肘和屈肘运动的？

2025-03-15 07:16:26

推荐回答（1个）

回答1：

骨骼肌有受刺激而收缩的特性，当骨骼肌受神经传来的刺激收缩时，就会牵动着它所附着的骨，绕着关节活动，于是躯体就产生了运动．但骨骼肌只能收缩牵拉骨而不能将骨推开，因此一个动作的完成总是由两组肌肉相互配合活动，共同完成的．
如图，屈肘时，肱二头肌收缩，肱三头肌舒张，伸肘时，肱三头肌收缩，肱二头肌舒张．

故答案为：屈肘时，肱二头肌收缩，肱三头肌舒张，伸肘时，肱三头肌收缩，肱二头肌舒张．

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