Read the assertion and reason carefully to mark the correct option in question.
Assertion: The two limbs of Henle’s loop form a counter current.
Reason: The flow of blood in the two limbs of Henle’s loop is in opposite direction.
If assertion is true but the reason is false.
Assertion-Reason relation
A counter current mechanism is defined as the movement of filtrate in opposite directions in the two arms of the Henle's loop and in the vasa recta.
The counter current occurs in both Henle’s loop and vasa recta since the movement of filtrate and blood, respectively, in their two limbs is in opposite direction. This process aids in the maintenance of a medullary concentration gradient.
Hence, the given assertion- “The two limbs of Henle’s loop forms a counter current” is true.
Henle’s loop is a hairpin shaped structure which extends into medullary region of nephron. It has two limbs- ascending limb and descending limb. The ultra filtrate flows through the limbs of loop of Henle, and not blood.
Hence, the given reason- “The flow of blood in the two limbs of Henle’s loop is in opposite direction” is false.
(c) If assertion is true but the reason is false.