The function of glucose in ORS-
**Core Concept**
The primary function of glucose in Oral Rehydration Solution (ORS) is related to the **intestinal absorption of sodium and water**, facilitated by the presence of glucose. This process is based on the concept of **co-transport** of sodium and glucose across the intestinal mucosa.
**Why the Correct Answer is Right**
Glucose in ORS helps in the **absorption of sodium** through the **sodium-glucose cotransporter (SGLT1)** in the small intestine. This mechanism enhances the absorption of sodium and consequently water, helping to rehydrate the body. The presence of glucose is crucial as it facilitates the uptake of sodium ions, which in turn drives the absorption of water, thereby aiding in the rehydration process.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it doesn't directly relate to the primary function of glucose in ORS.
**Option B:** Incorrect because while glucose does provide energy, its primary role in ORS is not as an energy source but to aid in rehydration.
**Option C:** Incorrect as it doesn't accurately describe the mechanism by which glucose functions in ORS.
**Option D:** This option might seem plausible but is less accurate in describing the primary function compared to the correct answer.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the **World Health Organization (WHO)** recommends the use of ORS with a specific ratio of sodium and glucose to effectively treat dehydration, especially in cases of diarrhea. The glucose component is essential for this purpose.
**Correct Answer:** D. Enhances sodium and water absorption.