Learn about Physical Responses to Emotion in this educational video from dizzo95.
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Male Speaker: Fear is one of the most extreme emotional feelings and like all extreme emotions is accompanied by physiological changes in the body. This illustration shows how the body prepares itself for fight or flight when in a highly emotional state initial signal comes from the brain which spur the body to release adrenaline into the blood stream. This then triggers off the series of interrelated responses in the body the mere thought of fear activates the frontal lobe of the cerebral cortex which stimulates the hypothalamus into action, the hypothalamus positioned in the brain activates the suprarenal medulla. The suprarenal medulla releases adrenaline into the blood stream and numerous responses in the body and so, the pupils in the eyes dilate, hairs stands on end if the skin is broken, blood were readily coagulate to prevent severe loss.
The chest expands to increase the volume of inhale the air. The bronchioles relax allowing greater volume of oxygen to enter the lungs the heart dilates increasing the blood output, blood pressure raises muscles contract blood vessels near the surface of the skin contract causing the skin to pale, other blood vessels dilate and the liver releases glucose which provides fuel for the muscles and the bladder empty stored urine in cases of extreme fear.