What is stress?
Stress is an ubiquitous and multilayered phenomenon that is an entrenched reality of our daily postmodern lives. In effect, the stress response has played a significant role in the evolution of our nervous system and was crucial for our survival on this planet. As hunter gathers we experienced acute stress when there were life-threatening perils from the environment confronting us for e.g. a wild animal that crossed the path of our foraging ancestors. In such instances, the human body would mobilize itself defensively and activate the autonomic nervous system to a fight, flight or freeze response to meet the demands of the situation.
When an organism is stressed and in either fight of flight mode, there are profound alterations due to the enervation of the sympathetic branch of the autonomic nervous system. Noticeable psychophysiological shifts take place such as an increase in the heart rate, blood pressure, respiration, muscle tension, sweat activity in conjunction with a cascade of neuro-endocrinological alterations. The adrenal-hypothalamus- pituitary axis gets activated and there are rapid secretions of the stress hormone cortisol along with blood moving from the periphery of the body i.e. the limbs to the core i.e. to the heart and lungs.
These psychosomatic shifts allow the organism to speed up the action that needed to be taken, which in most cases was either confrontation or agitated escape. However, in freeze mode, which occurs in profound experiences of trauma, the parasympathetic nervous, system dominates and the body drops in pressure, temperature, and mobility simulating a corpse. From an evolutionary perspective, the freeze mode was useful as on occasion predators may loose interest if the prey is already dead.
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