Not a biologist or anything, so I apologize if any of this sounds weird, but as far as I understand, the nerve messages from the brain cause muscles to flex causing our body parts to move, how does this work?
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You have nerves called motor neurons, these carry a signal from your nervous system, that signal goes to you muscle cells.
When the signal arrives, it triggers a chemical reaction in the muscle cells, where the cells release some ions into the protein structure of the muscle cells. Those ions make the proteins change shape, contracting from long strands into a more condensed shape, which is flexing them.
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