Question

Assertion (A): Efferent arteriole is wider than the afferent arteriole. 

Reason (R): The difference in the size of the diameter of these arterioles creates a high pressure known as hydrostatic pressure. This pressure helps in the process of ultrafiltration through the glomerulus.

1. A is True and R is False.
2. A is False and R is True.
3. Both A and R are True.
4. Both A and R are False.

Options

• (1)

• (2)

• (3)

• (4)

Answer 1

(2)

Explanation:

The afferent arteriole is wider than the efferent arteriole, not the other way around. Therefore, the Assertion (A) is false.

This diameter difference creates high hydrostatic pressure in the glomerulus, which helps drive ultrafiltration. Therefore, the Reason (R) is true.

Hence, A is false and R is true.