Final answer:
Three transport proteins, GLUT protein, SGLT protein, and Na+/K+ ATPase pump, work together in a gut epithelial cell to use glucose from food to power the body. GLUT protein enables glucose entry through facilitated diffusion, SGLT protein couples glucose and sodium ion movement into the cell through symport, and Na+/K+ ATPase pump maintains low sodium concentration inside the cell. This active transport process allows glucose to move against its concentration gradient.
Step-by-step explanation:
In a gut epithelial cell, three transport proteins work together to use glucose from food to power the body: GLUT protein, SGLT (Sodium-GLucose Transporter) protein, and Na+/K+ ATPase pump. The GLUT protein allows glucose to enter the cell through facilitated diffusion, while the SGLT protein couples the movement of glucose and sodium ions into the cell through symport. The Na+/K+ ATPase pump expels sodium ions out of the cell in exchange for potassium ions, maintaining a low sodium concentration inside the cell. This active transport process requires energy and allows glucose to move against its concentration gradient.