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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Really simple explanation:
The nerve touches the muscle and the signal from the brain travels down the nerve and into the muscle, causing it to flex.
The process is way more complex though, if your want I can explain it in more detail.
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