Skeletal muscle has the characteristic of stimulated contraction. When skeletal muscle contracts under nerve stimulation, it will affect the bones attached to it and move around the joints, so the body will move. However, skeletal muscles can only contract and pull bones, but can't push them away. Therefore, the completion of an action is always completed by the cooperation of two groups of muscles. For example, when people bend their elbows, the muscles mainly composed of biceps brachii are contracting and triceps brachii are relaxing. Muscles mainly composed of triceps brachii are in a relaxed state. When the elbow is extended, the biceps brachii relaxes and the triceps brachii contracts.

So the answer is: skeletal muscle; Bones; common