Which of the following images shows an edge-on spiral galaxy? 
Definitions:
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.
Cardiac Output
The volume of blood the heart pumps through the circulatory system in one minute.
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