The hormone that promotes reabsorption of water from glomerular filtrate is

Options

A. Oxytocin
B. Vasopressin
C. Relaxin
D. Calcitonin

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the hormone that promotes the reabsorption of water from the glomerular filtrate in the kidneys.

2. **Identifying the Options**: The options provided are:
- A) Oxytocin
- B) Vasopressin
- C) Relaxin
- D) Calcitonin

3. **Analyzing Each Option**:
- **Oxytocin**: This hormone is primarily involved in childbirth and lactation. It does not play a role in water reabsorption in the kidneys.
- **Vasopressin**: Also known as antidiuretic hormone (ADH), this hormone is secreted by the pituitary gland and is crucial for regulating water balance in the body. It increases the permeability of the collecting ducts in the kidneys, allowing more water to be reabsorbed back into the bloodstream.
- **Relaxin**: This hormone is involved in pregnancy and childbirth, helping to relax the uterine muscles and ligaments. It does not influence water reabsorption.
- **Calcitonin**: This hormone is involved in calcium homeostasis and does not have a role in water reabsorption in the kidneys.

4. **Conclusion**: After analyzing all the options, it is clear that the hormone responsible for promoting the reabsorption of water from the glomerular filtrate is **Vasopressin**.

5. **Final Answer**: The hormone that promotes reabsorption of water from glomerular filtrate is **Vasopressin**.

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