Vasporessin in mainly responsible for

Options

A. Obligatory reabsorption of water through Bowman's capsule
B. Facultative reabsorption of water from DCT
C. Faculative reabsorption of water from Henle's loop
D. Obligatory reabsorption of water from PCT

Answer

**Step-by-Step Solution:**

1. **Understanding Vasopressin**: Vasopressin, also known as antidiuretic hormone (ADH), plays a crucial role in regulating water balance in the body. It is produced in the hypothalamus and released from the posterior pituitary gland (neurohypophysis).

2. **Function of Vasopressin**: The primary function of vasopressin is to promote water reabsorption in the kidneys. It acts on the kidneys to increase the permeability of the collecting ducts and distal convoluted tubules (DCT) to water.

3. **Mechanism of Action**: When the body experiences a decrease in blood volume or an increase in sodium concentration (often due to dehydration), vasopressin is released into the bloodstream. This hormone signals the kidneys to reabsorb more water back into the bloodstream, thereby reducing urine output and helping to maintain blood volume and osmolarity.

4. **Identifying the Correct Option**: Among the options provided:
- Obligatory reabsorption of water through the Bowman’s capsule
- Facultative reabsorption of water from DCT
- Facultative reabsorption of water from the loop of Henle
- Obligatory reabsorption of water from PCT

The correct answer is that vasopressin is mainly responsible for the **facultative reabsorption of water from the distal convoluted tubule (DCT)**.

5. **Conclusion**: Therefore, the answer to the question is that vasopressin is mainly responsible for the facultative reabsorption of water from the distal convoluted tubule.

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