The main functions of the digestive tract are:
1. Secretory – providing the production and excretion by the glandular cells of digestive juices (saliva, gastric, pancreas, intestinal, bile) containing enzymes and factors (or substances) that ensure their high activity.
2. Motor, or motor, – which is carried out by the muscles of the digestive apparatus and provides a change in the state of aggregation of food, its grinding, mixing with digestive juices and movement.
3. Suction – providing the transfer of the final products of digestion, water, salts and vitamins through the mucous membrane from the cavity of the digestive tract into the internal environment of the body (blood and lymph).
4. Excretory (excretory) – realized by isolating from the body some metabolic products (metabolites), salts of heavy metals, drugs;
5. Protective – provided by the barrier function of the gastrointestinal tract, which protects the body from harmful agents (bactericidal, bacteriostatic and detoxifying effects).
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.