Breathing circuit: reservoir bag: practice question

A Anaesthesia 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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Anaesthesia · Breathing circuit: reservoir bag

Sample item

In a breathing circuit, a compliant rubber component of about 2 litres lets the anaesthetist squeeze to ventilate by hand, feel the compliance of the lungs, and meet peak inspiratory flow demands when fresh gas flow is lower. It also limits pressure in the circuit. Which component is this?

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

The answer and the reasoning

A. Reservoir bag

The reservoir bag stores gas, allows manual ventilation, gives tactile feedback about compliance and airway resistance, shows spontaneous breathing movements, and acts as a buffer that limits pressure because it distends. The APL valve vents gas, and the valves and canister serve other functions.

Option by option

  • A. Reservoir bag (correct)

    Correct. A compliant 2 L store used for hand ventilation and for feeling compliance.

  • B. Adjustable pressure-limiting valve

    The APL valve is a spring-loaded vent that releases excess gas, and it is not a compliant store.

  • C. Soda lime canister

    The soda lime canister removes carbon dioxide and does not allow manual ventilation.

  • D. Unidirectional expiratory valve

    A unidirectional expiratory valve only stops backflow of gas and has no storage capacity.

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 Anaesthesia question

What is the answer to this Anaesthesia question?

The best answer is A, Reservoir bag. The reservoir bag stores gas, allows manual ventilation, gives tactile feedback about compliance and airway resistance, shows spontaneous breathing movements, and acts as a buffer that limits pressure because it distends.

Why is "Adjustable pressure-limiting valve" not the answer?

The APL valve is a spring-loaded vent that releases excess gas, and it is not a compliant store.

Why is "Soda lime canister" not the answer?

The soda lime canister removes carbon dioxide and does not allow manual ventilation.

Why is "Unidirectional expiratory valve" not the answer?

A unidirectional expiratory valve only stops backflow of gas and has no storage capacity.

What concept does this question test?

It tests Breathing circuit: reservoir bag in Anaesthesia. The APL valve vents gas, and the valves and canister serve other functions.

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 Breathing circuit: reservoir bag?

Make a table of each agent, its key advantage and its main side effect. Then use the flashcards and the other Anaesthesia 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.