Blood 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 · Blood physiology

Sample item

What protein carries most oxygen in blood?

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

The answer and the reasoning

B. Hemoglobin

Hemoglobin within erythrocytes binds and transports the great majority of oxygen in blood, allowing delivery far beyond what dissolved oxygen alone could provide.

Option by option

  • A. Fibrinogen

    Fibrinogen is a clotting protein.

  • B. Hemoglobin (correct)

    Correct: hemoglobin is the principal oxygen carrier.

  • C. Transferrin

    Transferrin transports iron.

  • D. Albumin

    Albumin primarily maintains oncotic pressure and transports solutes.

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, Hemoglobin. Hemoglobin within erythrocytes binds and transports the great majority of oxygen in blood, allowing delivery far beyond what dissolved oxygen alone could provide.

Why is "Fibrinogen" not the answer?

Fibrinogen is a clotting protein.

Why is "Transferrin" not the answer?

Transferrin transports iron.

Why is "Albumin" not the answer?

Albumin primarily maintains oncotic pressure and transports solutes.

What concept does this question test?

It tests Blood physiology in Physiology. The correct option holds because: Correct: hemoglobin is the principal oxygen carrier.

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 Blood 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.