Nervous Systems : The Nervous System Essay

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So, the sympathetic nervous system sets off a reaction and it “causes your adrenal glands to release large amounts of adrenaline” (ibid.). You may feel the sudden jolt with an accompanying “feeling of dread and terror.” It is not in your imagination! A lower level stress does this in the body too. Let’s continue.
“Within seconds, the excess adrenaline can cause:
1) your heart to race,
2) your respiration to become rapid and shallow,
3) profuse sweating,
4) trembling and shaking, and
5) cold hands and feet.” (ibid.).
Your sympathetic nervous system also produces muscle contractions. This is the freeze part of fight and flight. It can lead you to experience strong contractions in your chest or throat and feeling like you can 't breathe.
"Other reactions caused by the sympathetic nervous system include excess release of stomach acid, inhibition of digestion, release of red blood cells by the spleen, release of stored-up sugar by the liver, increase in metabolic rate, and dilation of the pupils.” (ibid.).
When I first read this years ago, I instantly thought migraine attack. So, you might experience an extreme flush of adrenaline and you might not. But don’t be fooled, the body prepares for each attack and this places stress on the body.
On a smaller level the hypothalamic − pituitary − adrenal gland also known as the HPA axis controls the stress response. The hypothalamus, in the brain, regulates basic bodily functions like: stress, body temperature, hunger, sleep and

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