What is the name for the smallest arteries?

The smallest arteries in the circulatory system are called arterioles. These blood vessels are crucial in regulating blood flow and blood pressure within the body. Arterioles branch off from small arteries and lead directly into capillaries, where the exchange of oxygen, carbon dioxide, nutrients, and waste products occurs.

Arterioles have a muscular wall that allows them to constrict and dilate, playing a significant role in controlling blood flow to different tissues based on their metabolic needs. This capability is vital for maintaining homeostasis and ensuring that various organs receive adequate blood supply when needed.

Understanding the role of arterioles highlights their importance in the overall function of the cardiovascular system, particularly in terms of blood distribution and pressure regulation.