伸肘时，肱二头肌和肱三头肌所处的状态分别是

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同时收缩同时舒张肱二头肌收缩，肱三头肌舒张肱二头肌舒张，肱三头肌收缩

收缩，收缩收缩，舒张舒张，收缩舒张，舒张

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肱二头肌和肱三头肌都收缩肱二头肌收缩，肱三头肌舒张肱二头肌和肱三头肌都舒张肱二头肌舒张，肱三头肌收缩

肱二头肌收缩，肱三头肌收缩肱二头肌收缩，肱三头肌舒张肱二头肌舒张，肱三头肌收缩肱二头肌舒张，肱三头肌舒张

肱二头肌收缩，肱三头肌舒张肱三头肌收缩，肱二头肌舒张肱三头肌收缩，肱二头肌收缩肱二头肌舒张，肱三头肌舒张

收缩、舒张收缩、收缩舒张、收缩舒张、舒张

肱二头肌收缩，肱三头肌舒张二者都舒张肱二头肌舒张，肱三头肌收缩二者都收缩

收缩、收缩收缩、舒张舒张、收缩舒张、舒张

肱二头肌收缩、肱三头肌收缩肱二头肌收缩、肱三头肌舒张肱二头肌舒张、肱三头肌收缩肱二头肌舒张、肱三头肌舒张

收缩，舒张收缩，收缩舒张，收缩舒张,舒张

肱二头肌收缩肱二头肌舒张肱三头肌收缩肱三头肌舒张

肱二头肌舒张、肱三头肌收缩肱二头肌、肱三头肌同时舒张肱二头肌、肱三头肌同时收缩肱二头肌收缩、肱三头肌舒张

肱二头肌收缩，肱三头肌舒张肱三头肌收缩，肱二头肌舒张肱三头肌收缩，肱二头肌收缩肱二头肌舒张，肱三头肌舒张

肱二头肌和肱三头肌都收缩肱二头肌和肱三头肌都舒张肱二头肌收缩，肱三头肌舒张肱二头肌舒张，肱三头肌收缩

肱二头肌收缩，肱三头肌舒张肱二头肌和肱三头肌同时收缩肱二头肌舒张，肱三头肌收缩肱二头肌和肱三头肌同时舒张

肱二头肌、肱三头肌都收缩肱二头肌、肱三头肌都舒张肱二头肌收缩、肱三头肌舒张肱二头肌舒张、肱三头肌收缩