After an adrenaline rush, why do humans experience a sudden severe drop in energy? Would this not be disadvantageous for primitive survival?

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After an adrenaline rush, why do humans experience a sudden severe drop in energy? Would this not be disadvantageous for primitive survival?

In: Biology

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The surge in adrenaline allows a person to enter fight or flight with more power than they would normally use. The resting period afterward allows the person to conserve energy, heal injury and hide from additional threat.

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