Why do muscles shake when tired? Doesn’t that take even more energy?
In: Biology
That “shaking” is not being able to pull 100% of the time and instead firing only part of the time, as much as it can.
In the spirit of ELI5: It’s like when you’re drinking through a straw and get to the bottom of the cup. You go from “nice smooth silent drinking” (100% “on”) to a spluttering on-and-off “shaky” flow. That flow is NOT drawing more liquid than the smooth drinking was, it’s sputtering out to nothing.
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