求翻译：根据产生动作的不同骨骼肌又分为屈肌和伸肌。屈肌与伸肌成对出现，力量拮抗。例如上肢肌中的肱二头肌是产生前臂屈曲的屈肌，位于上臂的腹侧，肱三头肌是产生前臂伸直的伸肌，位于上臂的背侧。位置相近的不同肌肉可以协同产生同一作用，所以，又把肌肉分为不同的肌群。是什么意思？

Different skeletal muscle of the action is divided into flexor and extensor. The flexor and extensor muscles in pairs, the forces antagonistic. Such as the biceps in the upper limb to produce flexion the flexor forearm, ventral in the upper arm, triceps forearms stretched the extensor, located in th

In accordance with the different skeletal muscle actuation is also divided into premier and stretch out on. Aggrieved, and extends into the Convention, and the Forces opioid antagonist. For example upper extremities in the European Convention on 2 is a forearm and buckling of the leading convention

According to produces the movement different skeletal muscle to divide into the flexor and the extensor.The flexor and the extensor pair appearance, the strength oppresses anti-.For example in the upper limb muscle musculus biceps brachii produces the forearm flexure flexor, is located the upper arm

According to the action is divided into different skeletal muscle flexor and extensor muscles. Flexor and extensor muscle pair, antagonism of forces. Such as the biceps muscle in the upper extremity muscle is the flexor muscles of the forearm flexion, located in the abdominal side of the upper arm,

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