Have you ever trembled with nervousness? The body has this type of reaction when subjected to extreme emotions, such as fear, nervousness or hatred, for example, and the response is in neurotransmitters, the chemical produced by the brain. What happens is that when the human being is faced with a threatening situation, a surge of adrenaline and noradrenaline prepares the body to fight or flee quickly.
In these conditions, the sympathetic nervous system dilates the pupils, initiates sweating, and stimulates blood flow to our muscles. It is the release of adrenaline into the blood that brings out these effects. To understand why, we need to turn our attention to the beginnings of humanity. At that time, these bodily reactions allowed for capturing prey, escaping predators, or fighting. That’s because the body does its best to get ready for physical activity.
Basically, the brain cannot distinguish a predator’s urgency at sight from a public performance, for example, and makes the body shiver in the same way. Another aspect that causes tremor is involuntary muscle tension, especially if it happens for a long period.
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And this tension is exactly what happens in situations of fear (where the person cringes, for example) or anger (where the person clenches his fists). Adrenaline acts directly on muscle receptor cells to accelerate the rate of contraction of the fibers. Norepinephrine, in turn, is related to physical arousal. Production is centered on the area of the brain called the locus coeruleus (a small, bluish region of the brainstem). Lack of norepinephrine, in fact, is often associated with depressive disorders.