Which part of the syringe is responsible for pushing the drug solution through the needle?

The plunger is the component of the syringe that is responsible for pushing the drug solution through the needle. When the plunger is pressed, it creates pressure within the barrel of the syringe, forcing the liquid medication to move into the needle and exit through its tip. This mechanism is essential for the accurate delivery of medications, such as vaccines or other injections, ensuring that the correct dosage reaches its intended target.

The barrel of the syringe holds the drug solution and allows the user to see the amount of medication being drawn up or administered. While the needle is the part through which the medication is delivered into the body, it is not responsible for pushing the solution; it simply serves as the exit point for the medication. The hub is the section that connects the needle to the syringe barrel, providing structural support but also does not play a role in the movement of the drug solution. Understanding the specific functions of these parts is crucial in using syringes effectively in clinical or veterinary settings.