人体对食物的消化吸收课件

1、人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收Digestive system人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收小鼠小肠吸收细胞电镜像 9900Mv微绒毛，N细胞核人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收The disaccharidase enzymes are sucrase

2、 and lactase. These enzymes sit on the brush border of the intestinal cells. After maltose is produced by the amylase enzyme, sucrase splits the maltose to produce glucose, which is then absorbed in to the blood stream. The sugar in milk is lactose. On the surface of the small intestine is a second

3、enzyme, which splits the lactose in to glucose and galactose. This is the lactose enzyme. 人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收

4、人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收The slide shows the most important steps which are involved in cholesterol absorption. Bile acids solubilize dietary and biliary cholesterol in micelles which are phagocytosed by intestinal

5、epithelial cells. The phagocytosed cholesterol is esterified with fatty acid by acyl-CoA cholesterol acyl transferase (ACAT, a microsomal enzyme). Cholesterol esters are used by microsomal triglyceride transfer protein (MTP) to assemble chylomicrons which are secreted into the lymph. A significant p

6、art of cholesterol that is taken up by the intestinal epithelium is secreted back to the intestinal lumen via the ABC transporter A1 (ABC1). 人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收人体对食物的消化吸收Iron abundance states: iron w

7、ithin the enterocyte is trapped by incorporation into ferritin and hence, not transported into blood. When the enterocyte dies and is shed, this iron is lost.Iron limiting states: iron is exported out of the enterocyte via a transporter (ferroportin) located in the basolateral membrane. It then binds to the iron-carrier transf