What is significance of efferent arteriole being narrow than afferent arteriole?

Explanation

### Step-by-Step Solution:

1. **Understanding the Structure**: The afferent arteriole is the blood vessel that carries blood into the glomerulus of the kidney, while the efferent arteriole carries blood away from the glomerulus. The afferent arteriole is wider than the efferent arteriole.

2. **Function of Afferent Arteriole**: The afferent arteriole is responsible for delivering blood to the kidneys. This blood contains both waste products and useful substances. The larger diameter allows for a greater volume of blood to flow into the glomerulus for filtration.

3. **Filtration Process**: In the glomerulus, the blood undergoes filtration. This process separates waste products and excess substances from useful components. The filtration occurs due to the pressure difference created by the wider afferent arteriole.

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