Which of the following statement is not true w.r.t. nephron?

Options

A. (a) Cortical nephrons are more common.
B. (b) Cortical nephrons lack vasa recta.
C. (c) In juxtamedullary nephrons, the blood first passes through vasa recta and then through the capillaries of glomerulus
D. (d) The glomeruli of juxtamedullary nephrons are placed close to the inner margin of the cortex.

Answer

To determine which statement is not true with respect to nephron, we will evaluate each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Nephrons**: Nephrons are the functional units of the excretory system responsible for filtering blood and forming urine. They are classified into two main types: cortical nephrons and juxtamedullary nephrons.

2. **Evaluating Option A**:
- Statement: "Cortical nephrons are more common."
- Analysis: This statement is true. Cortical nephrons make up about 85% of the total nephrons in the kidneys.

3. **Evaluating Option B**:
- Statement: "Cortical nephrons lack vasa recta."
- Analysis: This statement is also true. Cortical nephrons have peritubular capillaries but do not have vasa recta, which are found in juxtamedullary nephrons.

4. **Evaluating Option C**:
- Statement: "In juxtamedullary nephrons, the blood first passes through vasa recta and then through the capillaries of glomerulus."
- Analysis: This statement is false. In juxtamedullary nephrons, blood does not pass through vasa recta before the glomerulus. Instead, blood flows directly to the glomerulus first.

5. **Evaluating Option D**:
- Statement: "Glomeruli of juxtamedullary nephrons are placed close to the inner margin of cortex."
- Analysis: This statement is true. Juxtamedullary nephrons are indeed located near the inner margin of the cortex.

6. **Conclusion**: The only statement that is not true is option C. Therefore, the correct answer is option C.

### Final Answer:
The statement that is not true with respect to nephron is option C.

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