## **Core Concept**
The absorption of glucose in the intestine involves specific transport mechanisms that facilitate its uptake from the intestinal lumen into the bloodstream. This process is crucial for glucose homeostasis and energy supply to the body. The primary mechanism involves cotransport with sodium ions.

## **Why the Correct Answer is Right**
The correct answer, **Sodium-glucose cotransporter 1 (SGLT1)**, is right because SGLT1 is a key transporter in the small intestine responsible for the absorption of glucose from the intestinal lumen. It works by cotransporting one sodium ion and one glucose molecule into the intestinal epithelial cells, utilizing the downhill movement of sodium ions to drive the uptake of glucose against its concentration gradient. This mechanism is essential for the efficient absorption of glucose.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because, although facilitated diffusion by **GLUT2** is involved in the basolateral transport of glucose out of the intestinal cells into the bloodstream, it is not the primary mechanism for glucose absorption from the intestinal lumen.
- **Option B:** This option is incorrect as it does not specify a known mechanism or transporter for glucose absorption in the intestine.
- **Option D:** This option is incorrect because, while **GLUT5** is involved in the transport of fructose, not glucose, in the intestine.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the sodium-glucose cotransporter (SGLT1) is crucial for glucose absorption. Inhibitors of SGLT2 (not SGLT1) are used in diabetes management to reduce glucose reabsorption in the kidneys, but understanding SGLT1 is vital for comprehending intestinal glucose absorption.

## **Correct Answer:** . Sodium-glucose cotransporter 1 (SGLT1)