The explanation I’ve heard is that we can move because our muscles expand and contract. But then I don’t know how they do that. It feels to me like the answer I hear about how I can move is “smaller things that you are made from move and it makes you move”. I would like to understand on a fundamental level how this process works. I want to know what the smallest component of that process does that results in me being able to do something like type on a keyboard. Thanks.
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You’re essentially asking how/why metabolism in general happens. I’m not sure I can ELI5 that, but at the end of the “why” chain is just chemistry. Molecules interact in certain set ways, and the simplest living thing thing is a big group of molecules, doing exactly the right chemical reactions that keep those reactions going and make copies of the thing.
Your muscles move because chemical reactions in your brain, because your DNA built your brain to be a chemical reaction machine, because every brain that didn’t work that way died.
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