当双手自然下垂时,肱二头肌和肱三头肌所处的状态分别为舒张,收缩?可是答案说都是舒张.不懂

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• 肱二头肌和肱三头肌都处于舒张状态,则双手呈（）,都处在收缩状态,双手呈（）状态,表明肌肉间有（）关系虽然知道手在自然下垂都是舒张状态,拎重物的时候都是收缩状态,但不确定这个空是不是这样答
• 当双手自然下垂时,肱二头肌和肱三头肌所处的状态分别为舒张,收缩?可是答案说都是舒张.不懂肱二头肌和肱三头肌是不是任何时候都是一个收缩一个舒张呢?
• 当双手自然下垂时,肱二头肌和肱三头肌所处的状态分别为舒张,收缩?可是答案说都是舒张.不懂
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