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Course: AP??/College Biology?>?Unit 2
Lesson 5: Membrane transportMembrane transport
Problem
The model below shows how glucose, sodium ions ( ), and potassium ions ( ) move between the intestinal lumen, an epithelial cell, and the blood in the small intestine. The relative concentrations of glucose, , and inside and outside the epithelial cell are indicated.
Based on the model, which of the following movements does not require an input of energy?