Injections are most commonly given with a syringe; which of the following is NOT one of the three main parts of a syringe?

A syringe consists of three main parts: the barrel, plunger, and needle. The barrel is the hollow tube that holds the liquid or medication being injected, and it is marked with calibrations for measuring the volume. The plunger is a movable component that fits into the barrel and is used to draw in and expel the fluid. The needle is attached to the end of the barrel and is used to penetrate the skin or other tissues for administration of the injection.

The component referred to as "tube" is not one of the main parts of a syringe. While the barrel itself can be described as a type of tube, it is the specific structure of the barrel that serves a defined purpose in the function of the syringe, not a generic "tube." Therefore, identifying "tube" as the incorrect option highlights a misunderstanding of terminologies within the anatomy of the syringe.