How does D-glucose cross the apical membrane of small intestinal enterocytes?
Answer and explanation
Correct answer: D. Secondary active symport driven by an inward sodium gradient via SGLT1 pathway
Glucose uptake across the apical brush-border membrane occurs against its concentration gradient through SGLT1, powered by the inward sodium electrochemical gradient. GLUT2 mediates facilitated diffusion across the basolateral membrane, not primary active apical transport.
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