The part of nephron involved in active reabsorption of sodium is

Options

A. distal convelutes tubule
B. proximal convoluted tubule
C. Bowman's capsule
D. descending limb of Henle's loop

Explanation

To answer the question "The part of nephron involved in active reabsorption of sodium is," we will follow these steps:

### Step 1: Understand the Structure of the Nephron
The nephron is the functional unit of the kidney and consists of several parts: the glomerulus, Bowman's capsule, proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting duct.

### Step 2: Identify the Function of Each Part
Each part of the nephron has specific functions:
- **Glomerulus**: Filtration of blood to form urine.
- **Proximal Convoluted Tubule (PCT)**: Reabsorption of nutrients, water, and ions.
- **Loop of Henle**: Concentration of urine through the reabsorption of water and salts.
- **Distal Convoluted Tubule (DCT)**: Further reabsorption and secretion, regulated by hormones.
- **Collecting Duct**: Final concentration of urine.

### Step 3: Focus on Sodium Reabsorption
Sodium reabsorption occurs primarily in the PCT and DCT. However, the PCT is known for its active transport mechanisms that reabsorb sodium ions into the bloodstream.

### Step 4: Confirm the Active Reabsorption Process
The PCT reabsorbs approximately 67% of filtered sodium actively, utilizing ATP to transport sodium against its concentration gradient. This process is vital for maintaining electrolyte balance and blood pressure.

### Step 5: Conclusion
Based on the functions of the nephron and the specific role of the proximal convoluted tubule, the correct answer to the question is:
**The part of nephron involved in active reabsorption of sodium is the Proximal Convoluted Tubule (PCT).**