Sugar Gate Challenge

Glucose–galactose malabsorption is shown as a “broken gate” in the small intestine: SGLT1 can’t absorb glucose or galactose, so sugar stays in the gut and pulls in water, while fructose uses a different transporter and can still get through. Tap the transporter doors in the diagram, then switch between the mechanism view, the quiz sets, and the rapid-recall tab to test yourself.