What in the region of human being scared- what portion of your shy system controls this resposne? What are the physiological?

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The part of the nervy system they are probably asking about is the autonomic concerned sytem--specifically the sympathetics, which are responsible for what is termed the "struggle or flight" response, also called hyperarousal or the acute stress response.
The physiological effects are to shunt blood away from visceral organs similar to the stomach and skin and route it to heart, lungs, muscle and brain. The pupils dilate. Fine hairs within the skin become erect (the 'hair stands on end' phenomenon). Heart rate and breathing rates increase. Secretions in the crack ducts and GI tract are reduced. The whole concept, as the name imply, is to be prepared to react to threat.
The response is due to the release of catecholamines, mostly epinephrine and norepinephrine.
It is called "box or flight" Google it. I am not going to do your homework for you.
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