Three Components of Anxiety. Physical symptomsCognitive componentBehavioral component. Physiology of Anxiety: Physical System. Perceived dangerBrain sends message to autonomic nervous systemSympathetic nervous system is activated (all or none phenomena)Sympathetic nervous system is the fight/flight systemSympathetic nervous system releases adrenaline and noradrenalin (from adrenal glands on the kidneys).These chemicals are messengers to continue activity.
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