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Nervous tension immediately tightens every muscle and nerve in the body and restricts the normal action and free and rhythmic flow of the various circulations. It holds the poisons in the body preventing their free exudation and by their presence creates more poisons.
The anatomy of anxiety. Anxiety is a reaction to stress that has both psychological and physical features. The feeling is thought to arise in the amygdala, a brain region that governs many intense emotional responses. As neurotransmitters carry the impulse to the sympathetic nervous system, heart and breathing rates increase, muscles tense, and blood flow is diverted from the abdominal organs to the brain. In the short term, anxiety prepares us to confront a crisis by putting the body on alert.