Detailed description:

The mode of glucose absorption in small intestine by small intestine villous epithelial cells is secondary active transport. The sodium ion concentration in small intestine is higher than that in small intestine villous epithelial cells, so there is a gradient of sodium ion concentration difference between them, through which glucose and sodium ions can enter small intestine villous epithelial cells through ion channels; With the continuous inflow of sodium ions, the concentration gradient of sodium ions gradually decreases. In order to maintain the concentration gradient difference between the inside and outside of sodium ions in order to absorb glucose, at this time, the sodium ion-potassium ion pump in the small intestinal villous epithelial cells is turned on, which consumes ATP, so that the sodium ions in the small intestinal villous epithelial cells flow back to the small intestine, and the sodium ion concentration gradient needed for transporting glucose is formed again.