In a syringe, the main purpose of the barrel is?

Appeared in: NHM UP Staff Nurse - 2017

Explanation

The barrel is the main body of the syringe, designed as a hollow cylinder.
Its primary function is to serve as a reservoir for holding the liquid medication before administration.
The barrel features calibrated markings (graduations) on its surface, which are essential for accurately measuring the prescribed dose of the medication.

Option B: The barrel's cylindrical shape does not inherently prevent rolling. In fact, some syringes have flanges at the end of the barrel to stop them from rolling on flat surfaces, but this is a secondary feature, not the main purpose of the barrel itself.
Option C: The needle connects to the syringe at the 'tip', not the barrel. The tip can be a Luer-Lok (threaded) or Luer-slip (friction-fit) design, which provides a secure connection for the needle hub.
Option D: This option is incorrect because there is a correct answer among the choices. Option A accurately describes the main purpose of the syringe barrel.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification and function of syringe components as background academic context rather than a clinical decision trigger.
Understanding the function of each syringe part is fundamental for safe medication administration. A nurse must select the correct syringe size based on the volume to be administered, and the barrel's calibrations are critical for dose accuracy.
Maintaining the sterility of key parts, such as the inside of the barrel and the syringe tip, is crucial to prevent infection during parenteral medication administration.
What if? If a nurse touches the inside of the barrel or the plunger shaft while preparing an injection, the syringe is considered contaminated and must be discarded to prevent introducing microorganisms into the patient's body.

How to Approach the Question

First, identify the key term in the question, which is 'barrel' of a 'syringe'.
Recall the basic structure and function of a syringe. Visualize or refer to the provided image to locate the barrel.
Evaluate each option based on your knowledge and the visual aid. The image clearly shows the barrel as the main chamber holding the liquid.
Option A states the barrel holds the liquid. This matches its appearance and known function.
Option B is about preventing rolling. The barrel is cylindrical and would roll; flanges might prevent this, but that's not the barrel's main purpose.
Option C mentions connecting the needle. The image and knowledge confirm the 'tip' connects the needle, not the barrel.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 168-170

Practise the full NHM UP Staff Nurse - 2017

Attempt every question from this paper in a timed mock, then review the full solution for each one.