Excitation of the sympathetic department allows the body to mobilize all available reserves to overcome the sudden load, stimulating the necessary and inhibiting functions that are unnecessary for this activity. In turn, the parasympathetic department changes the activity of internal organs in the opposite direction, contributing to the renewal of the vital resources of the body. Thus, both subdivisions of the nervous system act on the principle of complementation.
The higher centers of autonomic regulation in the hypothalamus work as a whole, providing fast and reliable regulation of all body systems. In order to lower blood pressure, it is necessary to reduce the frequency and strength of heart contractions. This effect is achieved by simultaneously reducing sympathetic and enhancing parasympathetic effects on the heart.
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