基本内容食物在消化道中借助于消化管的运动和消化液的化学分解作用,被分解为分子小,结构简单的可吸收的物质的过程叫做消化。食物的可吸收部分透过肠粘膜进入血液或淋巴液的过程叫做吸收。消化系统由消化道和消化腺组成。各种消化腺每昼夜分泌并进入消化道中的消化液总量多达8升。消化液中含有多种消化酶,能分别对蛋白质,脂肪和糖等物质进行逐步分解。消化液中含有大量无机盐。保持了各段消化管内的酸硷度,为消化酶发挥作用提供了适宜的环境。消化液中的粘液对消化道起保护作用。消化道不仅具有消化和吸收功能,而且还有内分 Basic content Food in the digestive tract by means of digestive tube movement and chemical decomposition of digestive juice, was broken down into small molecules, simple structure of the absorbable substance process is called digestion. The process by which the absorbable part of the food enters the blood or lymph through the intestinal mucosa is called absorption. The digestive system consists of digestive tract and digestive gland. Digestive glands secrete up to 8 liters of digestive juice each day and night and enter the digestive tract. Digestive juice contains a variety of digestive enzymes, respectively, proteins, fats and sugars and other substances to be gradually decomposed. Digestive fluid contains a large number of inorganic salts. Maintain the pH of the digestive tract within each segment, to digestive enzymes play a role in providing an appropriate environment. Digestive mucus in the digestive tract play a protective effect. Digestive tract not only has digestion and absorption, but also within the points