What feature of a hypodermic needle aids in its attachment to the syringe?

The hub is the component of a hypodermic needle that enables it to securely attach to the syringe. This part ensures a tight fit, which is essential for proper medication delivery and to prevent leaks of medication during administration. The hub is designed to lock into the syringe, allowing for a secure connection that maintains stability while injecting.

The other features of the hypodermic needle serve different purposes. The hilt, for instance, provides a grip for handling and controlling the needle but does not play a role in securing it to the syringe. The bevel is the slanted tip of the needle that facilitates easier penetration into the skin and tissues, but it also does not contribute to the attachment mechanism. Lastly, the lumen is the hollow channel within the needle through which the medication flows, which is important for delivering the dose but unrelated to the attachment process. Thus, the hub is the critical component that allows the needle to connect reliably with the syringe.