Digestive System

The purpose of the digestive system is to prepare food for hundreds of millions of somatic cells. Food does not reach the cells even if you eat it (because it can not enter the bloodstream through the intestinal wall unless it is in a useful chemical state). And secretion of endocrine secretion and movement of food through the digestive tract Food in the oral cavity enters the digestive system from the mouth and mouth, and the mucous membrane is lined.

Animals can have two kinds of digestive system. There is a dead-end digestive system and a one-way digestive system. Death digestive system is a digestive system in which animals eat food, then it is digested and released by animals. Animals such as sponges and echinoderms have this digestive system. On the other hand, the one-way digestive system is the source of food, digestion, not the other end of the animal. Animals such as antelope, mollusk, chordate (vertebrate), arthropod and the like have this digestive system.

The complete digestive system is a digestive system with different starting and ending points. Gastrointestinal organs break down food into beneficial parts of the body and help us gain energy. Another type of digestive system is the incomplete digestive system, which has the same food opening and excreta outlet. Since each organ is independent and can be specialized, the complete digestive system can better absorb nutrients. It also allows continuous uptake of food, which can make animals larger and form more complex structures. Humans have a complete digestive system, special organs such as the stomach and small intestine work in various ways, and can absorb nutrition more effectively.

The organ system is a group of special organs working together to meet key physiological needs. For example, mouth, esophagus, stomach, small intestine, and colon are all gastrointestinal organs. The digestive system is an organ system responsible for breaking down food into nutrients that can be transported via blood.

The area of ​​the digestive system is divided into two parts, the digestive tract and the auxiliary organ. The digestive tract of the digestive system consists of mouth, pharynx, esophagus, stomach, small intestine and large intestine, rectum and anus. What is related to the gastrointestinal tract is the following auxiliary organ. Salivary gland, liver, gall bladder, pancreas