Muscle 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 · Muscle physiology

Sample item

What ion binds troponin to initiate skeletal muscle contraction?

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

The answer and the reasoning

C. Calcium

The relevant Muscle physiology principle makes Calcium the best answer because it directly explains the structure or physiological response in the stem.

Option by option

  • A. Magnesium

    Magnesium is not supported by the key clue provided in this item.

  • B. Sodium

    Sodium does not correspond to the structure or response being tested.

  • C. Calcium (correct)

    Correct. Calcium directly follows from the core muscle physiology relationship.

  • D. Chloride

    Chloride is associated with a different anatomical or physiological role.

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.

More Physiology questions

Questions about this Physiology question

What is the answer to this Physiology question?

The best answer is C, Calcium. The relevant Muscle physiology principle makes Calcium the best answer because it directly explains the structure or physiological response in the stem.

Why is "Magnesium" not the answer?

Magnesium is not supported by the key clue provided in this item.

Why is "Sodium" not the answer?

Sodium does not correspond to the structure or response being tested.

Why is "Chloride" not the answer?

Chloride is associated with a different anatomical or physiological role.

What concept does this question test?

It tests Muscle physiology in Physiology. The correct option holds because: Correct. Calcium directly follows from the core muscle physiology relationship.

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 Muscle 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.