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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What you’re asking about is a topic called signal transduction, which is the process through which cells communicate with each other using molecules. The communication molecule (secreted by the nerves) bind with receptors on the outside of the cell, which then causes a cascade of reactions inside the cell. The messenger molecule never actually enters the muscle cells though, it stays outside.
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