The part of nephron involved in active reabsorption of sodium is

Options

A. Distal convoluted tubule
B. Proximal convoluted tubule
C. Bowman's capsule
D. Descending limb of Henle's loop

Answer

To solve the question regarding which part of the nephron is involved in the active reabsorption of sodium, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Parts of the Nephron**:
- The nephron consists of several parts:
- Glomerulus
- Bowman's capsule
- Proximal convoluted tubule (PCT)
- Loop of Henle
- Distal convoluted tubule (DCT)
- Collecting duct

2. **Understand the Function of Each Part**:
- Glomerulus: Responsible for the filtration of blood.
- Bowman's capsule: Collects the filtrate from the glomerulus.
- Proximal convoluted tubule (PCT): Primarily involved in the reabsorption of various substances, including sodium.
- Loop of Henle: Mainly involved in the reabsorption of water and salts.
- Distal convoluted tubule (DCT): Involved in further reabsorption but not primarily for sodium actively.
- Collecting duct: Involved in the final concentration of urine.

3. **Focus on Active Reabsorption of Sodium**:
- Active reabsorption requires energy (ATP).
- The PCT is known for the active transport of sodium ions back into the bloodstream.

4. **Evaluate Each Option**:
- **Distal convoluted tubule (DCT)**: Incorrect, as it does not primarily perform active reabsorption of sodium.
- **Proximal convoluted tubule (PCT)**: Correct, as it actively reabsorbs sodium using ATP.
- **Bowman's capsule**: Incorrect, as it is mainly for filtration, not reabsorption.
- **Descending limb of Loop of Henle**: Incorrect, as it is primarily involved in the reabsorption of water.

5. **Conclusion**:
- The part of the nephron involved in the active reabsorption of sodium is the **Proximal Convoluted Tubule (PCT)**.

### Final Answer:
The part of the nephron involved in active reabsorption of sodium is the **Proximal Convoluted Tubule (PCT)**.