Arteriole
/ɑːrˈtɪriəʊl/
Definition 1 of 1
Pro Tip 1/3Vessel Size
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 2/3Blood 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 3/3Blood Pressure
By changing diameter, arterioles play a critical role in controlling blood pressure. 
High arteriole resistance can contribute to hypertension.