Renal physiology: practice question

A Physiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Physiology · Renal physiology

Sample item

What is the usual effect of antidiuretic hormone on urine concentration?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

C. Increases urine concentration

Antidiuretic hormone increases collecting-duct water permeability, allowing water reabsorption and producing a smaller volume of more concentrated urine.

Option by option

  • A. Blocks water reabsorption

    ADH promotes rather than blocks collecting-duct water reabsorption.

  • B. Causes maximal dilute urine

    Maximally dilute urine occurs when ADH effect is low.

  • C. Increases urine concentration (correct)

    Correct: ADH concentrates urine by increasing water reabsorption.

  • D. Stops glomerular filtration

    ADH does not normally stop glomerular filtration.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Physiology question

What is the answer to this Physiology question?

The best answer is C, Increases urine concentration. Antidiuretic hormone increases collecting-duct water permeability, allowing water reabsorption and producing a smaller volume of more concentrated urine.

Why is "Blocks water reabsorption" not the answer?

ADH promotes rather than blocks collecting-duct water reabsorption.

Why is "Causes maximal dilute urine" not the answer?

Maximally dilute urine occurs when ADH effect is low.

Why is "Stops glomerular filtration" not the answer?

ADH does not normally stop glomerular filtration.

What concept does this question test?

It tests Renal physiology in Physiology. The correct option holds because: Correct: ADH concentrates urine by increasing water reabsorption.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Renal physiology?

For each system, sketch the key graph (pressure–volume loop, oxygen dissociation curve, nephron handling) and explain it aloud. Then use the flashcards and the other Physiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.