What is the joint work of the sympathetic and parasympathetic departments of the autonomic nervous system

The sympathetic section is a part of the autonomic nervous tissue, which, together with the parasympathetic, ensures the functioning of internal organs, chemical reactions responsible for the vital activity of cells. The internal environment of a person is under the direct influence of the sympathetic and parasympathetic nervous system.
They supply the same tissues with nerves, ensuring their interconnection, with the central system often having exactly the opposite effect on these organs.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.