Hormones – substances with high biological activity, are produced by the endocrine glands and go directly into the blood. The action of hormones is strictly specific and occurs even in very low concentrations. They maintain the constancy of the internal environment of the body, affect metabolism, growth, reproduction, development and interaction with the external environment.
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.