What is the essence of the principle of direct and feedback in the regulation of functions?

The nervous system controls the secretory functions of a number of endocrine glands. In turn, with feedback, synthesized biologically active substances change the functional state of the nervous system.

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.