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I heard that if you are tasered, all your voluntary muscles clench and unclench. I don't think you would want to try this though.
If you mean contract all your voluntary (skeletal) muscles voluntarily, the answer is no. Even an anatomist, that could identify every skeletal muscle in the body, wouldn't be able to contract them all, even one at a time.Further, during normal muscle contraction all of the muscle fibers in a single muscle do not contract all at once (NOTE- skeletal muscle cells are often called fibers because of their unusual appearance). When you make a controlled movement, such as pick up a delicate and light weight object, you don't crush it and fling it up because only a few muscle fibers in the appropriate muscles were contracted. When you hold a heavy weight up for an extended period, a larger portion of muscle fibers are used, but never all because the fibers tire quickly and they have to, sort of, take turns.
I tried but it didn't seem to work...
Quote from: Chemistry4me on 17/12/2010 05:39:35I tried but it didn't seem to work...In my experience it is not possible for a man to clench his butt cheeks together to hold in a fart, let alone tense everything up all at once. 
Variola, regarding your specific example, I think this may be a difference between men and women. Steve
Whot? I am perfectly able to clench my...