Simplify the rational expression. 
Definitions:
Arteriography
A radiologic study of an artery using a radiopaque medium.
Carotid Artery
A major artery that supplies blood to the brain, neck, and face.
Ventricles
The two lower chambers of the heart, or the four connected cavities in the brain, each having specific functions related to circulating blood or cerebrospinal fluid.
Internuncial Neurons
Neurons that act as intermediaries between sensory and motor neurons in the nervous system.
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