muscles
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TIL: Children exhibit a more comparable neuromuscular fatigue profile to endurance athletes than untrained adults. They have fatigue-resistant muscles and they recover faster than adults. Much of this stems from the levels of uptake and distribution of oxygen and how they synergize energy faster.
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whatilearned
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TIL that goosebumps are an evolutionary throwback caused by small spikes in adrenaline that cause miniature muscles connected to each hair to contract, creating the bump and causing the hair to stand up. In animals, this insulates them and makes the animal appear bigger to ward of predators.
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whatilearned
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