What part of the syringe is responsible for piercing the skin?

The needle is the component of the syringe specifically designed for piercing the skin. It is a slender, sharpened tube that allows for the delivery of medication or the extraction of fluids directly into or from the body. When using a syringe for injections, the needle's point is crafted to easily penetrate skin tissues, ensuring that the procedure is as smooth and efficient as possible.

In contrast, the plunger is the part that is pushed to expel or draw the liquid in the barrel, while the barrel holds the fluid being injected. The cap serves as a protective cover for the needle, preventing contamination and accidental punctures before use. Each of these parts has a distinct function, but only the needle possesses the design features necessary for penetrating the skin.