Like if I said to you “raise your left arm” you could do it without even really thinking about it. You just will it to happen and it happens. How does that work?
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Muscles are easy. Imagine being tased, your muscles tense up. Well the nerves that control your muscles do the same exact thing, your brain sends an electric pulse to the nerve, which then causes your muscle to contract. The strength of the pulse determines just how much it contracts.
And considering it’s an electric signal, it basically moves at the speed of light — though in reality, significantly reduced due to various factors, but still a fraction of a second to travel a few feet.
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