消化是人体摄取食物后,通过消化管的运动(机械性消化)和消化液的作用(化学性消化),分解为精华和糟粕两部分,吸取其精华,排泄糟粕的整个变化过程。消化系统的组成和功能消化系统由消化管和消化腺两部分组成。消化管是一条长的肌性管道,根据其位置、形态和功能的不同,可分为口腔、咽、食管、 Digestion is the body’s food intake, through the digestive tract movement (mechanical digestion) and digestive juice (chemical digestion), broken down into essence and dross in two parts, to learn the essence of excretion of the entire process of dross. Digestive system composition and function Digestive system by the digestive tract and digestive gland two parts. Digestive tract is a long muscle pipeline, according to their location, shape and function of different, can be divided into oral cavity, pharynx, esophagus,