Final answer:
The bevel of the needle is the part that allows medication to flow from the syringe into the body when injecting a medication.
Step-by-step explanation:
When injecting a medication, the part of the needle that allows the medication to flow from the syringe to the needle is the bevel. The bevel is the slanted tip at the end of the needle which creates a sharp pointed edge, enabling the needle to penetrate the skin and tissue. The design of the bevel allows for a smoother insertion and creates a narrow opening in the skin for the medication to be administered into the body.