In the presence of caffeine in the body: the effect of narcotic and sleeping pills is reduced; reflex excitability of the brain increases; the nerve centers of the respiratory and vasomotor systems are excited; the activity of the heart increases, and myocardial contractions become more frequent and intense; shock states under the influence of caffeine can cause high blood pressure; diuresis increases as a result of decreased reabsorption of electrolytes in the kidneys due to caffeine; platelet aggregation decreases and secretion in the stomach increases.
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