Question 73

The barrel holds the withdrawn liquid, while the plunger manipulates the liquid.

The barrel of a syringe is designed to contain the liquid that has been withdrawn, while the plunger is the component that is used to push or pull the liquid through the syringe.

A) The plunger manipulates the liquid, while the Luer-lock locks in the correct dose

This statement is incorrect because it inaccurately describes the function of the Luer-lock. The Luer-lock is designed to secure the needle to the syringe, not to lock in the correct dose.

B) The plunger contains measurement markings, while the Luer-lock locks in the needle

While it is true that the Luer-lock secures the needle, the statement falsely attributes measurement markings to the plunger. In reality, the barrel typically contains the measurement markings that indicate the volume of liquid.

C) The needle holds the withdrawn liquid, while the plunger contains measurement markings

This option is incorrect as the needle does not hold the liquid; rather, it is the barrel that contains the liquid. Additionally, measurement markings are found on the barrel, not on the plunger.

D) The barrel holds the withdrawn liquid, while the plunger manipulates the liquid

This statement is correct because it accurately reflects the functions of the syringe components. The barrel is indeed responsible for holding the liquid, while the plunger is used to manipulate that liquid, either by drawing it in or pushing it out.

Conclusion

Option D is definitively correct as it accurately describes the roles of the barrel and the plunger in a syringe. The other options fail either by misidentifying the functions of the parts or by providing incorrect information about which part holds the liquid or contains measurement markings. Understanding these components is crucial for effective syringe use in medical and laboratory settings.