What is the general adaptation syndrome in stress response?

Hans Selye's general adaptation syndrome describes the body's three-stage response to prolonged stress. The alarm stage is the initial fight-or-flight response where the sympathetic nervous system activates, releasing adrenaline and cortisol, increasing heart rate, blood pressure, and blood sugar. The resistance stage occurs as the body adapts to ongoing stress, maintaining elevated hormone levels while appearing to function normally, though resources are being depleted. ---