When a person faces sudden stress, he or she may experience an “adrenaline rush,” during which the adrenal glands secrete hormones that work to increase blood-sugar levels and increase oxygen consumption and blood flow in skeletal muscles, while decreasing oxygen consumption and blood flow in smooth muscles.

Why do these internal bodily responses make sense?
They help a person to


An increase in blood flow and oxygen consumption in skeletal muscles facilitates the sort of muscle activity needed for bursts of strength, agility, and energy. The adrenal glands’ response is an evolutionary survival mechanism—for fighting or fleeing from predators and other dangers.

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