Figure F-1: A uniform resource locator (URL) 
Referring to the figure above, the first section showing "https:" is the ____.
Definitions:
Vessel Type
A classification for the various kinds of vessels in the circulatory system, such as arteries, veins, and capillaries.
Circulatory System
A bodily system consisting of the heart, blood, and blood vessels that transport nutrients, oxygen, and waste products throughout the body.
Arteriole Dilation
The widening of arterioles, small branches of arteries leading to capillaries, which can decrease blood pressure and increase blood flow to specific areas of the body.
Total Blood Volume
The total volume of blood circulating within an individual's body, crucial for the delivery of nutrients and removal of waste products.
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