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 main function of the proximal tubule?

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

The answer and the reasoning

C. Bulk reabsorption of filtered solute and water

The proximal tubule reabsorbs most filtered sodium, water, bicarbonate, glucose, and amino acids through extensive transport mechanisms.

Option by option

  • A. Production of erythropoietin only

    Erythropoietin is made by renal interstitial cells.

  • B. Fine control of potassium secretion only

    Potassium fine-tuning occurs distally.

  • C. Bulk reabsorption of filtered solute and water (correct)

    Correct: proximal nephron performs bulk reabsorption.

  • D. Storage of urine

    Urine is stored in bladder.

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, Bulk reabsorption of filtered solute and water. The proximal tubule reabsorbs most filtered sodium, water, bicarbonate, glucose, and amino acids through extensive transport mechanisms.

Why is "Production of erythropoietin only" not the answer?

Erythropoietin is made by renal interstitial cells.

Why is "Fine control of potassium secretion only" not the answer?

Potassium fine-tuning occurs distally.

Why is "Storage of urine" not the answer?

Urine is stored in bladder.

What concept does this question test?

It tests Renal physiology in Physiology. The correct option holds because: Correct: proximal nephron performs bulk 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.