The movement of glucose from the lumen into the proximal tubule cells is an example of secondary active transport.
Proximal tubule is the first nephron segment after the glomerulus where reabsorption commences. The proximal tubule has the role contributing towards fluid, electrolyte, and nutrient homeostasis. It is also involved in potassium reabsorption.
Secondary active transport is the type of active transport where the movement of a molecule against its concentration gradient is facilitated by the energy released by the downhill movement of another molecule. The movement of the two molecules can be in opposite direction or in the same direction. The example of such a transport is glucose symporter SGLT1.
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