Q2068: Which of the following statements about the reabsorption pro...

Class NEET 2026 ALL Q #2068

COMPETENCY BASED

APPLY

4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE

Which of the following statements about the reabsorption process in Henle's loop are correct?
(a) The descending limb of Henle's loop is permeable to water but almost impermeable to electrolytes.
(b) Urine gets concentrated in Henle's loop.
(c) Reabsorption of $Na^{+}$ and water takes place in Henle's loop.
(d) Active or passive transport of electrolytes occurs in the ascending limb of Henle's loop.
Choose the correct answer from the options given below:

(A) (a), (b) and (d) only

(B) (a) and (b) only

(D) (a), (b) and (c) only

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AI Tutor Explanation

Detailed Solution

Step 1: Analyze the descending limb

The descending limb of the loop of Henle is permeable to water but almost impermeable to electrolytes. This allows water to move out of the filtrate, concentrating the urine. Thus, statement (a) and (b) are correct.

Step 2: Analyze the ascending limb

The ascending limb is impermeable to water but allows transport of electrolytes. This transport can be active (in the thick segment) or passive (in the thin segment). Thus, statement (d) is correct.

Step 3: Evaluate statement (c)

Statement (c) claims reabsorption of $Na^{+}$ and water takes place in the loop of Henle. While $Na^{+}$ is reabsorbed in the ascending limb, water is NOT reabsorbed in the ascending limb. Therefore, statement (c) is incorrect.

Step 4: Conclusion

Since (a), (b), and (d) are correct, the correct option is (A).

Final Answer: (A)

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Pedagogical Audit

Bloom's Analysis: This is an APPLY question because it requires the student to apply knowledge of renal physiology and membrane permeability to evaluate specific physiological statements.

Knowledge Dimension: CONCEPTUAL

Justification: The question tests the understanding of the counter-current mechanism and the functional anatomy of the nephron, which are core conceptual pillars of the Excretory Products and their Elimination chapter.

Syllabus Audit: In the context of NEET, this is classified as COMPETENCY. It moves beyond rote memorization by forcing the student to distinguish between the functional properties of different segments of the loop of Henle.