As compared to efferent arteriole, the afferent arteriole of kidney is

Options

A. Shorter and wider
B. Shorter and narrower
C. Longer and wider
D. Longer and narrower

Answer

To answer the question "As compared to efferent arteriole, the afferent arteriole of kidney is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Arterioles**:
- The afferent arteriole is the blood vessel that carries blood to the glomerulus of the nephron, while the efferent arteriole carries blood away from the glomerulus.

2. **Compare the Diameter**:
- The afferent arteriole has a larger diameter compared to the efferent arteriole. This is important because the larger diameter allows more blood to flow into the glomerulus.

3. **Consider the Length**:
- The afferent arteriole is generally shorter than the efferent arteriole. This is due to its direct connection from the renal artery to the glomerulus.

4. **Analyze Blood Pressure**:
- When blood flows through the afferent arteriole, it encounters a decrease in diameter as it enters the glomerulus, which causes an increase in blood pressure. This increased pressure is crucial for the process of ultrafiltration.

5. **Identify the Correct Option**:
- Based on the comparison, the afferent arteriole is wider and shorter than the efferent arteriole. Therefore, the correct answer to the question is that the afferent arteriole is wider and shorter compared to the efferent arteriole.

### Final Answer:
The afferent arteriole of the kidney is wider and shorter compared to the efferent arteriole.