Vasopressin stimulates reabsorption of water and reduction of urine secretion. Hence vasopressin is otherwise called

Options

A. angiotensin
B. neurotransmitter
C. antidiuretic hormone
D. growth regulating substance

Answer

To answer the question regarding what vasopressin is otherwise called, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Vasopressin**: Begin by recognizing that vasopressin is a hormone that plays a crucial role in regulating water balance in the body.

2. **Source of Vasopressin**: Identify that vasopressin is synthesized in the hypothalamus and released from the posterior pituitary gland.

3. **Function of Vasopressin**: Note that the primary function of vasopressin is to stimulate the reabsorption of water in the kidneys, specifically in the collecting ducts, which reduces urine output.

4. **Physiological Stimulus**: Understand that the secretion of vasopressin is primarily triggered by an increase in plasma osmolality, although it can also be stimulated by decreases in blood pressure and blood volume.

5. **Role in Urine Production**: Acknowledge that by promoting water reabsorption, vasopressin decreases the amount of water excreted in urine, which is essential for maintaining fluid balance in the body.

6. **Alternative Name**: Based on its function of reducing urine output and conserving water, conclude that vasopressin is also known as **antidiuretic hormone (ADH)**.

### Final Answer:
Vasopressin is otherwise called **antidiuretic hormone (ADH)**.

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