People call cortisol a “stress hormone,” but this is a mistake. Cortisol is released whenever you need a surge of energy, which happens to include the times when you are stressed. Its main purpose is to flood the bloodstream with glucose to provide immediate energy to cells, allowing, for example, muscle cells to stretch and contract so you can run. Your body-budgeting regions also make you breathe more deeply to get more oxygen into your bloodstream and dilate your arteries to get that oxygen to your muscles more quickly so your body can move. All of this internal motion is accompanied by
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