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Physiological or biological stress is an organism's response to a stressor such as an environmental condition. Stress is a body's method of reacting to a challenge. According to the stressful event, the body's way to respond to stress is by sympathetic nervous system activation which results in the fight-or-flight response.
Stimulation of the adrenal glands to release norepinephrine and epinephrine, which are responsible for the cascade of reactions associated with stress. An increase in heart rate, which results in an increased delivery of oxygen and nutrients to the brain and the muscles to prepare them for the stress.