乳糖酶位于小肠粘膜上皮刷状缘的顶端,主要作用为将进入小肠的乳糖山双糖分解为葡萄糖和半乳糖等单糖而迅速在小肠内吸收转运,如乳糖酶缺乏(Lactasedeficiency,LD)时,乳糖的消化吸收遂发生障碍,可导致腹泻、腹痛、腹胀、腹部不适及肠鸣等症状,作 Lactase is located at the tip of the brush border of small intestine mucosa, the main role is to enter the small intestine lactose disaccharide into glucose and galactose and other monosaccharides quickly absorbed in the small intestine transport, such as lactase deficiency (Lactase deficiency, LD) , Digestion and absorption of lactose then obstacles, can lead to diarrhea, abdominal pain, abdominal distension, abdominal discomfort and bowel symptoms such as