Which part of the syringe is referred to as the middle section?

The middle section of a syringe is known as the barrel. The barrel is the main body of the syringe that holds the medication or liquid to be administered. It is typically marked with measurement markings, which allow for precise dosing of fluids. The design of the barrel enables the plunger, which fits snugly inside, to create suction or push the liquid out when pressure is applied.

Understanding that the barrel is the part responsible for containing the fluid helps clarify its function within the overall structure of the syringe. It differs from the plunger, which is the component that injects the substance and is located at one end, and the hub, which connects the needle to the syringe. The filter is not relevant in this context as it is used to prevent particulates from entering the syringe.