Secondary active transport (SGLT)
The SGLT1 transporter moves glucose into intestinal cells against its concentration gradient. What provides the energy?
Answer B: explanation for every choice
A
Direct ATP use would be primary active transport. SGLT1 does not hydrolyze ATP.
B
Correct. SGLT1 couples glucose uptake to Na⁺ moving down its gradient, which the pump maintains. That is secondary active transport.
C
Facilitated diffusion moves solutes only down their gradients.
D
Glucose is moving against its gradient, so its gradient cannot power the transport.
TakeawaySecondary active transport uses an ion gradient built by primary active transport.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID bb74.