Final answer:
The slanted tip of the needle that enters the patient's vein is known as the bevel. It is designed to penetrate skin and veins with minimal discomfort, and alongside the hub and the shaft, forms a critical component of the needle's anatomy.
Step-by-step explanation:
The slanted tip of the needle that enters the patient's vein is called the bevel. Needles are composed of three main parts: the hub, which is the part that attaches to the syringe; the shaft, which is the long body of the needle; and the bevel, the slanted part that creates a sharp pointed tip allowing the needle to easily penetrate skin and vein walls with minimal trauma.
The bevel's design is significant because a properly angled bevel can make the insertion into a vein smoother and less painful for the patient. It is the sharpness and the angle of the bevel that plays a crucial role in the ease of needle insertion.