General anatomy and histology: urinary tract lining: practice question

A Anatomy 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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Anatomy · General anatomy and histology: urinary tract lining

Sample item

A bladder biopsy shows a lining whose surface cells are large, dome-shaped, sometimes binucleate, with a thickened asymmetric luminal membrane that resists stretch and urine. Which epithelium is this?

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

The answer and the reasoning

A. Transitional epithelium

The urinary tract from the renal calyces to the proximal urethra is lined by transitional epithelium, whose superficial umbrella cells flatten when the bladder fills. Their plaque-bearing membrane and tight junctions keep urine from diffusing into the wall.

Option by option

  • A. Transitional epithelium (correct)

    Correct. Large dome-shaped surface cells with a plaque-bearing membrane characterise this stretchable lining.

  • B. Stratified squamous non-keratinised epithelium

    This lines the vagina and oesophagus and has flat surface cells, not dome-shaped ones.

  • C. Simple cuboidal epithelium

    This lines small ducts and kidney tubules and is a single layer, so it cannot show dome-shaped umbrella cells.

  • D. Pseudostratified ciliated columnar epithelium

    This lines the trachea and carries cilia and goblet cells, which the biopsy lacks.

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 Anatomy question

What is the answer to this Anatomy question?

The best answer is A, Transitional epithelium. The urinary tract from the renal calyces to the proximal urethra is lined by transitional epithelium, whose superficial umbrella cells flatten when the bladder fills.

Why is "Stratified squamous non-keratinised epithelium" not the answer?

This lines the vagina and oesophagus and has flat surface cells, not dome-shaped ones.

Why is "Simple cuboidal epithelium" not the answer?

This lines small ducts and kidney tubules and is a single layer, so it cannot show dome-shaped umbrella cells.

Why is "Pseudostratified ciliated columnar epithelium" not the answer?

This lines the trachea and carries cilia and goblet cells, which the biopsy lacks.

What concept does this question test?

It tests General anatomy and histology: urinary tract lining in Anatomy. Their plaque-bearing membrane and tight junctions keep urine from diffusing into the wall.

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 General anatomy and histology: urinary tract lining?

Learn every nerve by its route, its muscles and what a lesion looks like at the bedside. That one habit answers a large share of questions. Then use the flashcards and the other Anatomy 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.