A large amount of about `180` L of fluid is filtered by the human kidneys per day. Which one of the following renal corpuscle features does not justify this ?
a) The efferent arteriole is wider than the afferent arteriole causing easier outflow of blood from the glomerulus
b) The glomerular capillaries have a large surface area
c) The glomerular capillaries are fenestrated and hence leakier than other capillaries
d) The glomerular capillaries have a higher blood pressure than the other capillaries of the body

Options

A. The efferent arteriole is wider than the afferent arteriole causing easier outflow of blood from the glomerulus
B. The glomerular capillaries have a large surface area
C. The glomerular capillaries are fenestrated and hence leakier than other capillaries
D. The glomerular capillaries have a higher blood pressure than the other capillaries of the body

Answer

To determine which feature of the renal corpuscle does not justify the large amount of fluid filtered by the human kidneys (about 180 liters per day), we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Filtration Process**: The kidneys filter a significant volume of fluid daily. This high filtration rate is primarily due to certain structural and functional characteristics of the renal corpuscle, particularly the glomerulus.

2. **Analyzing Option A**:
- **Statement**: The efferent arteriole is wider than the afferent arteriole causing easier outflow of blood from the glomerulus.
- **Analysis**: If the efferent arteriole were wider than the afferent arteriole, it would lead to a decrease in pressure within the glomerulus, resulting in a lower filtration rate. Therefore, this statement does not justify the high filtration rate.

3. **Analyzing Option B**:
- **Statement**: The glomerular capillaries have a large surface area.
- **Analysis**: A large surface area allows for more blood to be filtered at once, justifying the high volume of fluid filtered.

4. **Analyzing Option C**:
- **Statement**: The glomerular capillaries are fenestrated and hence leakier than other capillaries.
- **Analysis**: The fenestrations (small pores) in the capillaries increase permeability, allowing more fluid to pass through, which supports a higher filtration rate.

5. **Analyzing Option D**:
- **Statement**: The glomerular capillaries have a higher blood pressure than the other capillaries of the body.
- **Analysis**: Higher blood pressure in the glomerular capillaries is a crucial factor that enhances the filtration rate, thus justifying the high volume of fluid filtered.

6. **Conclusion**: Based on the analysis, the correct answer is **Option A**. The statement that the efferent arteriole is wider than the afferent arteriole does not justify the high filtration rate because it would actually lead to a lower filtration rate.

### Final Answer:
**Option A**: The efferent arteriole is wider than the afferent arteriole causing easier outflow of blood from the glomerulus.