Oral histology and anatomy: striated ducts: practice question

A Dentistry 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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Dentistry · Oral histology and anatomy: striated ducts

Sample item

Which part of the salivary duct system reabsorbs sodium and chloride and secretes potassium and bicarbonate, so that final saliva is hypotonic?

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

The answer and the reasoning

A. Striated duct

Striated ducts have basal infoldings and many mitochondria that power ion exchange. They modify the primary, isotonic secretion into hypotonic saliva. Intercalated ducts mainly conduct secretion and contribute some proteins.

Option by option

  • A. Striated duct (correct)

    Correct. Striated duct cells modify the ionic content of saliva.

  • B. Excretory duct

    Excretory ducts mostly carry saliva to the mouth with little ion exchange.

  • C. Intercalated duct

    Intercalated ducts are small conduits that join the acini to the striated ducts.

  • D. Secretory acinus

    The acini produce the primary isotonic secretion and do not modify it.

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 Dentistry question

What is the answer to this Dentistry question?

The best answer is A, Striated duct. Striated ducts have basal infoldings and many mitochondria that power ion exchange.

Why is "Excretory duct" not the answer?

Excretory ducts mostly carry saliva to the mouth with little ion exchange.

Why is "Intercalated duct" not the answer?

Intercalated ducts are small conduits that join the acini to the striated ducts.

Why is "Secretory acinus" not the answer?

The acini produce the primary isotonic secretion and do not modify it.

What concept does this question test?

It tests Oral histology and anatomy: striated ducts in Dentistry. They modify the primary, isotonic secretion into hypotonic saliva. Intercalated ducts mainly conduct secretion and contribute some proteins.

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 Oral histology and anatomy: striated ducts?

Learn the dental formula, eruption ages and tooth structure once, as tables. Then use the flashcards and the other Dentistry 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.