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消化系统由消化管和消化腺两部分组成消化管是一条起自口腔延续为咽、食管、胃、小肠、大肠、终于肛门的很长的肌性管道,包括口腔、咽,食管、胃,小肠(十二指肠、空肠,回肠)和大肠(盲肠,结肠、直肠)等部消化腺有小消化腺和大消化腺两种小消化腺散在于消化管各部的管壁内,大消化腺有三对唾液腺(腮腺、下颌下腺、舌下腺)、肝和胰,它们均借导管,将分泌物排入消化管内消化系统的基本功能是食物的消化和吸收,供机体所需的物质和能量,食物中的营养物质除维生素,水和无机盐可以被直接吸收利用外,蛋白质、脂肪和糖类等物质均
Digestive system consists of digestive tract and digestive gland composed of two parts Digestive tract is a long since the oral continuation of the pharynx, esophagus, stomach, small intestine, large intestine, and finally anal muscle, including the mouth, pharynx, esophagus, stomach, small intestine (Duodenum, jejunum, ileum) and the large intestine (cecum, colon, rectum) and other parts of the digestive gland has a small digestive gland and digestive gland two small digestive gland scattered in the wall of digestive tract ministries, the digestive gland has three The salivary glands (parotid gland, submandibular gland, sublingual gland), liver and pancreas, they are through the catheter, the secretions into the digestive tract secretion of digestive system is the basic function of digestion and absorption of food for the body the required material and energy, Nutrients in food in addition to vitamins, water and inorganic salts can be absorbed directly, the protein, fat and carbohydrate substances are