An arteriole is smaller than an artery but larger than a capillary; size is key. The blood moved from the artery, through the arteriole, and into the capillaries.
Pro Tip 2/3
Blood Flow Control
Arterioles help regulate the flow and distribution of blood to different body areas. When exercising, arterioles in muscles dilate to increase blood flow.
Pro Tip 3/3
Blood Pressure
By changing diameter, arterioles play a critical role in controlling blood pressure. High arteriole resistance can contribute to hypertension.