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Adrenaline Rush

Adrenaline, or epinephrine, is a stress hormone which plays a major role in preparing the body for a fight-or-flight reaction in threatening situations. Adrenaline is in fact a survival hormone.  It helps us be faster and stronger under threat. Pre historic humans  when encountered with danger usually had two options: fight off the predator, or run for their lives. Each of these responses requires muscle strength.  Adrenaline triggers the physiological changes in our body to attack, defend, or run away.  Even before we react, or choose a course of action, our heart has already rushed oxygenated blood to our muscles, so we’ll be ready.

The immediate impact of an adrenaline surge are as follows:

•          Eyes dilate.

•          Heart beats faster.

•          Sweat increases.

•          Bronchioles dilate

•          Blood vessels dilate in our muscles.

•          Blood vessels constrict in our digestive tract to slow digestion.

•          Kidneys make more renin (to increase blood pressure).

•          Glucose production  increases, for energy.

 

The adrenaline also has a negative effect on memory. According to a research team in the Journal of Neuroscience, October 2008 – “In an emotionally stressful event that causes the release of Adrenaline, it can moderate memory consolidation of the events. Stress chemicals that function as neurotransmitters affect the storage of memories.

 

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