eli5 Why/how do muscles shrink?

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You get sore muscles when you train, because you muscle strings rip and when they heal, your muscles grow. As far as I know. So why and how do they shrink?

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Anonymous 0 Comments

Lots of people explaining why they shrink (to save energy when in disuse) but not the biological mechanics of how.

Obviously the body doesn’t magically know when to get rid of muscle, so what’s going on at a molecular level?

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