Given below are two statements: one is labeled Assertion (A) and other is labeled Reason (R).
Assertion (A): Reabsorption of water occurs passively in the initial segments of the nephron.
Reason (R): Reabsorption of water in the initial segments of the nephron is not influenced by ADH.
In the light of above statements, choose the correct answer from the options given below.

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Both A and R are true but R does not explain A.

Both A and R are false.

Both A and R are true and R explains A.

A is true but R is false.

answer is B.

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Detailed Solution

As reabsorption of water in the initial segments of the nephron is termed passive since it does not require the expenditure of ATP (energy). It is called obligatory reabsorption since it is not dependent on ADH. Reabsorption in the distal segment of the nephron that is dependent on ADH is termed facultative reabsorption.

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