Major portion of glomerular filtrate is reabsorbed in

Options

A. proximal convoluted tubule
B. distal convoluted tubule
C. ascending limb of loop of Henle
D. descending limb of loop of Henle

Answer

To solve the question regarding where the major portion of glomerular filtrate is reabsorbed, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Glomerular Filtrate**:
- Glomerular filtrate is the fluid that is filtered from the blood through the glomeruli in the kidneys. It contains water, glucose, amino acids, ions, and waste products.

2. **Identify the Renal Tubule Segments**:
- The renal tubule consists of several segments:
- Proximal Convoluted Tubule (PCT)
- Loop of Henle (which includes the descending limb and ascending limb)
- Distal Convoluted Tubule (DCT)

3. **Know the Function of Each Segment**:
- **Proximal Convoluted Tubule (PCT)**: This is the first segment of the renal tubule where a significant amount of reabsorption occurs.
- **Loop of Henle**: Primarily involved in the concentration of urine, with some reabsorption occurring but not as much as in the PCT.
- **Distal Convoluted Tubule (DCT)**: Involved in further reabsorption but to a lesser extent compared to the PCT.

4. **Determine the Percentage of Reabsorption**:
- It is known that about 70-80% of the glomerular filtrate is reabsorbed in the PCT.

5. **Select the Correct Answer**:
- Based on the information, the major portion of glomerular filtrate is reabsorbed in the **Proximal Convoluted Tubule (PCT)**.

### Final Answer:
The major portion of glomerular filtrate is reabsorbed in the **Proximal Convoluted Tubule (PCT)**.

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