小肠的主要功能是对摄入的食物进行消化和吸收。消化不充分而致一种或数种食物成分不能被吸收者称为消化不良,正常消化的产物不能经肠粘膜进入淋巴管或门静脉分支者称为吸收不良。消化是使复杂的营养物质分解为能被吸收的水溶性微粒的过程,它涉及肠腔内和刷状缘 The main function of the small intestine is to digest and absorb the ingested food. Inadequate digestion One or more food components can not be absorbed by the person referred to as dyspepsia. Normally digested products can not enter the lymphatic vessels via the intestinal mucosa or the portal vein branches are called malabsorption. Digestion is the process of breaking down complex nutrients into water-soluble particles that can be absorbed, which involves the intestine and the brush border