MEDICAL PHYSIOLOGY

Detailed explanation-1: -The sympathetic nervous system functions like a gas pedal in a car. It triggers the fight-or-flight response, providing the body with a burst of energy so that it can respond to perceived dangers. The parasympathetic nervous system acts like a brake.

Detailed explanation-2: -The sympathetic nervous system originates in the spinal cord and its main function is to activate the physiological changes that occur during the fight-or-flight response. This component of the autonomic nervous system utilises and activates the release of norepinephrine in the reaction.

Detailed explanation-3: -The sympathetic nervous system instigates the fight or flight response whilst the parasympathetic stimulates the freeze response. The autonomic nervous system releases adrenaline and cortisol, which are stress hormones. These hormones are largely responsible for the physiological changes which occur.