Respiratory 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 · Respiratory physiology

Sample item

Which factor shifts the oxyhaemoglobin dissociation curve to the right?

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

The answer and the reasoning

B. Increased carbon dioxide concentration

Higher carbon dioxide, temperature, and hydrogen ion concentration shift the curve right, promoting oxygen unloading to metabolically active tissues.

Option by option

  • A. Reduced hydrogen ion concentration

    Lower hydrogen ion concentration means alkalosis and left shift.

  • B. Increased carbon dioxide concentration (correct)

    Correct: carbon dioxide promotes the Bohr-effect right shift.

  • C. Fetal haemoglobin predominance

    Fetal haemoglobin has higher oxygen affinity and shifts left.

  • D. Decreased temperature

    Lower temperature shifts the curve left.

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 B, Increased carbon dioxide concentration. Higher carbon dioxide, temperature, and hydrogen ion concentration shift the curve right, promoting oxygen unloading to metabolically active tissues.

Why is "Reduced hydrogen ion concentration" not the answer?

Lower hydrogen ion concentration means alkalosis and left shift.

Why is "Fetal haemoglobin predominance" not the answer?

Fetal haemoglobin has higher oxygen affinity and shifts left.

Why is "Decreased temperature" not the answer?

Lower temperature shifts the curve left.

What concept does this question test?

It tests Respiratory physiology in Physiology. The correct option holds because: Correct: carbon dioxide promotes the Bohr-effect right shift.

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 Respiratory 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.