ADH or vasopressin is

Options

A. Enzyme that hydrolyses peptides
B. Hormone secreted by pituitary that promotes reabsorption of water from glomerular filtrate
C. Hormone that promotes glycogenolysis
D. Energy rich compound connected with muscle contraction.

Answer

**Step-by-Step Solution:**

1. **Understanding ADH**: ADH stands for Antidiuretic Hormone, which is also known as vasopressin. It is important to recognize that it is a hormone, not an enzyme or an energy-rich compound.

2. **Source of ADH**: ADH is secreted by the posterior lobe of the pituitary gland, specifically from the neurohypophysis. This is crucial to identify where the hormone originates.

3. **Function of ADH**: The primary function of ADH is to promote the reabsorption of water in the kidneys. This means that when ADH is present, the kidneys retain more water, leading to a decrease in urine production.

4. **Impact on Urine Production**: By increasing water reabsorption, ADH effectively reduces the volume of urine produced. This is an important aspect of its role in maintaining fluid balance in the body.

5. **Other Functions**: In addition to its role in water reabsorption, ADH can also cause contraction of arterioles and capillaries, which can influence blood pressure, and it may have effects on heart rate and maturation processes.

6. **Conclusion**: Based on the functions and characteristics of ADH, the correct answer to the question is that ADH or vasopressin is a hormone secreted by the pituitary that promotes the reabsorption of water from glomerular filtrate.

**Final Answer**: ADH or vasopressin is a hormone secreted by the pituitary that promotes the reabsorption of water from glomerular filtrate.

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