Venule is a tiny blood vessel that carries blood away from the capillaries and towards veins. It is one of the smallest blood vessels in the human body. Synonyms for venule include small vein, vascular shunt, and arteriolar-venular shunt. Venules are essential in regulating blood flow and maintaining blood pressure. They also assist in the exchange of vital substances such as oxygen, hormones, and nutrients through the walls of capillaries to the surrounding tissues. The human body has thousands of venules, which work together to form an extensive network of blood vessels. Without these small vessels, the body's circulatory system could not function correctly.