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B2.1.16 (HL)—Sodium-glucose cotransporters

Sodium-glucose cotransporters use sodium gradients to move glucose into epithelial cells by indirect active transport; This mechanism explains glucose recovery in kidney tubules and intestinal absorption.

Syllabus
First assessment 2025
Objective
B2.1.16
Level
HL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceNovember 2014
Most common paperPaper1
Typical marks1

Common command terms

  • Identify

Recent exam appearances

November 2014Paper1 ["HL"] · TZ06[ 1 ]B2.1.16 (HL)—Sodium-glucose cotransporters
Practice this objective

Coverage 2014–2014 · Updated 15 Jul 2026

Concept essentials

  • Glucose reabsorption in the proximal convoluted tubule uses active transport.
  • Sodium-glucose cotransport depends on a sodium gradient.
  • Sodium-potassium pumps maintain the gradient that powers cotransport.
  • The mechanism is indirect active transport rather than simple diffusion.
ConceptIB Biology HL