This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
Glucose absorption from the gut occurs by: 
Select and explain. 
A. Simple diffusion, B. Facilitated diffusion, C. Primary active transpo, D. Secondary active transpo
D: Secondary active transpo
Answer: D: Secondary active transpo 
Explanation: Glucose absorption from the gut occurs as co-transpo (secondary active transpo) with Na+ transpoer is SGLT-1 (sodium-glucose transpoer). SGLT-1 is a sympoer located on the luminal brush border of the enterocytes; it transpos 2 Na+ for every molecule of monosaccharide (glucose/galactose). Glucose moves across the basolateral membrane into the blood by passive transpo or facilitated diffusion GLUT-2 transpoer.