Assertion (A): Ascending limb of loop of Henle is impermeable to water and allows transport of electrolytes actively or passively.

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Q.
Given below are two statements.
One is labelled as Assertion (A) and the other is labelled as Reason (R)

Assertion (A): Ascending limb of loop of Henle is impermeable to water and allows transport of electrolytes actively or passively.
Reason (R): Dilution of filtrate takes place due to efflux of electrolytes in the medullary fluid.

In the light of the above statement, choose the correct answer from the options given below: [2023]

1 (A) is true but (R) is false.

2 (A) is false but (R) is true.

3 Both (A) and (R) are true and (R) is the correct explanation of (A).

4 Both (A) and (R) are true and (R) is not the correct explanation of (A).

Ans.
(3)

Since the ascending limb of loop of Henle is impermeable to water and permeable to electrolytes, the concentrated filtrate becomes diluted due to passage of electrolytes out from Henle’s loop into the medullary fluid.

Solution

1 (A) is true but (R) is false.

2 (A) is false but (R) is true.

3 Both (A) and (R) are true and (R) is the correct explanation of (A).

4 Both (A) and (R) are true and (R) is not the correct explanation of (A).

Ans.
(3)

Since the ascending limb of loop of Henle is impermeable to water and permeable to electrolytes, the concentrated filtrate becomes diluted due to passage of electrolytes out from Henle’s loop into the medullary fluid.

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Solution

1 (A) is true but (R) is false.

2 (A) is false but (R) is true.

3 Both (A) and (R) are true and (R) is the correct explanation of (A).

4 Both (A) and (R) are true and (R) is not the correct explanation of (A).

Ans. (3) Since the ascending limb of loop of Henle is impermeable to water and permeable to electrolytes, the concentrated filtrate becomes diluted due to passage of electrolytes out from Henle’s loop into the medullary fluid.

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Ans.
(3)

Since the ascending limb of loop of Henle is impermeable to water and permeable to electrolytes, the concentrated filtrate becomes diluted due to passage of electrolytes out from Henle’s loop into the medullary fluid.