which of the following cannot be considered as a difference between conical and juxtamedullary nephrons?

Options

A. length of the loop of Henie
B. presence or absence of Vasa recta
C. presence or absence of renal corpuscle
D. degree of extension of loop of Henie in medulla

Answer

To solve the question regarding the differences between conical (cortical) and juxtamedullary nephrons, we will analyze the characteristics of each type of nephron and identify which option cannot be considered a difference between them.

### Step-by-Step Solution:

1. **Understand the Types of Nephrons**:
- **Cortical Nephrons**: These nephrons are primarily located in the cortex of the kidney. They have shorter loops of Henle that do not extend deep into the medulla.
- **Juxtamedullary Nephrons**: These nephrons are located at the border of the cortex and medulla. They have longer loops of Henle that extend deep into the medulla, which is crucial for concentrating urine.

2. **Identify Key Differences**:
- **Length of Loop of Henle**: Juxtamedullary nephrons have a longer loop of Henle compared to cortical nephrons. This is a significant difference.
- **Presence of Vasa Recta**: Juxtamedullary nephrons have vasa recta (a series of capillaries that supply the nephron) while cortical nephrons do not. This is another important difference.
- **Presence of Renal Corpuscles**: Both types of nephrons have renal corpuscles, which are essential for the filtration process. Therefore, this characteristic cannot be considered a difference.
- **Degree of Extension of Loop of Henle into Medulla**: Juxtamedullary nephrons have loops that extend further into the medulla compared to cortical nephrons. This is also a difference.

3. **Conclusion**:
- The option that cannot be considered a difference between conical (cortical) and juxtamedullary nephrons is the **presence or absence of renal corpuscles**. Both types of nephrons have renal corpuscles, making this characteristic common to both.

### Final Answer:
The option that cannot be considered a difference between conical (cortical) and juxtamedullary nephrons is the **presence or absence of renal corpuscles**.

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