How the skeletal muscles move the body?

Answer 1

The muscles work like strings pull a puppet. The muscles are attached to the bones with tendons or ligaments and when the muscle contracts (or tenses) the muscle pulls the bone (as of on the skeletal muscles) and they relax your body goes limp or stops tensing in that area, the muscles pull from many different directions, many movements needing more than one muscle to do that, as so your brain programs the movements into your muscles, and sends the signals and as the muscles get the signals your body moves. Basically, that's how they do it... your brain

Answer 2

Muscles have a very early evolutionary appearance. In worms etc. But when the shell evolved, this combination allowed a whole new range of motion. This exoskeleton style is still found useful by the insects.

By and large, animal muscles use leverage in the production of motion, by attaching one end of the muscle to a bone; commonly near a joint; and the other end to the adjacent bone, a little more distant. (Consider the elbow). The joint is commonly an important part of a powerful muscle. But there are some muscle actions - e.g. blinking, digestion processes, and eye focussing, that don't need much skeletal attachment other than to position them.