73. Which of the following statements is true regarding syringe parts and their functions?
Answer: D
The barrel holds the withdrawn liquid, while the plunger manipulates the liquid.
The statement accurately describes the functions of the syringe parts. The barrel serves as the chamber that holds the liquid, while the plunger is the component that is pushed or pulled to manipulate the liquid within the barrel.
A) The plunger manipulates the liquid, while the Luer-lock locks in the correct dose
This option incorrectly 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. The plunger does manipulate the liquid but does not involve the Luer-lock in the dosing process.
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 to the syringe, this option inaccurately attributes measurement markings to the plunger. Instead, the barrel is the part of the syringe that typically contains measurement markings for dosage.
C) The needle holds the withdrawn liquid, while the plunger contains measurement markings
This statement is incorrect because the needle does not hold the withdrawn liquid; rather, it allows for the injection or withdrawal of the liquid from the barrel. Additionally, it is the barrel that contains the measurement markings, not the plunger.
D) The barrel holds the withdrawn liquid, while the plunger manipulates the liquid
This option correctly identifies the functions of both the barrel and the plunger. The barrel is designed to hold the liquid, while the plunger is used to push or pull the liquid within the syringe.
Conclusion
The correct answer is definitively right as it accurately describes the functions of the syringe's components. All other options fail to correctly attribute the roles of the parts involved, particularly in terms of where measurement markings are located and the actual functions of the Luer-lock and needle. Understanding these functions is crucial for effective usage of syringes in medical and laboratory settings.