Which part of the needle is NOT included in its components?

The barrel is not a component of a needle; it's part of a syringe. In the context of syringe-needle assemblies, the barrel refers specifically to the cylindrical part of the syringe that holds the medication or fluid. The needle itself is typically comprised of the bevel (the slanted tip that facilitates penetration), the point (the sharpened end that pierces the skin), and the hilt (the part of the needle that connects to the syringe). Understanding these components helps clarify the distinct roles they play in the administration of injections and other medical procedures.