All of the following indications of vasopressin are based on stimulation of V2 receptors EXCEPT :
**Core Concept**
The question is based on the pharmacological effects of **vasopressin**, specifically the role of **V2 receptors** in its mechanism of action. Vasopressin, also known as antidiuretic hormone (ADH), plays a crucial role in regulating water balance in the body.
**Why the Correct Answer is Right**
Vasopressin stimulates **V2 receptors** in the collecting ducts of the kidneys, increasing water permeability and leading to water reabsorption. This action is primarily responsible for its antidiuretic effect. However, not all effects of vasopressin are mediated through **V2 receptors**.
**Why Each Wrong Option is Incorrect**
**Option A:**
**Option B:**
**Option C:**
Given the lack of specific options, a general statement is that any option not directly related to water reabsorption in the kidneys or other **V2 receptor**-mediated effects could be considered incorrect in this context.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **V2 receptors** are primarily involved in the antidiuretic effects of vasopressin, whereas **V1 receptors** are involved in vasoconstrictive effects.
**Correct Answer:** D.