1. Do skelatel muscles always work in pairs?
2. Is the knee a ball and socket joint?
3. Do skeletal muscles fatigue after continued use?
1. Yes. An exensor and a reflexor. One relaxes when one contracts, always. You can however, through biofeedback, teach your muscles to work at the same time, but it is dangerous and painful because if both set of muscles pull on one bone, they can detach themselves from the bone.
2. No. A ball and socket joint would be your leg attached to you hip. The knee would be an elbow joint. It allows for movement either forwards or backwards.
3. Yes. All muscles have a certain amount of energy that they can exert before they become tired. It would be like trying to sprint an entire mile without getting tired... that is not possible because you would get tired quickly. The skeletal muscles are what move your body mainly.
I hope this helps.
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