The following questions refer to the figure below of a CTA of intracranial and extracranial arteries. 
-Which arrow points to the internal carotid artery?
Definitions:
Noise
Unwanted sound or signal that interferes with the communication, detection, or measurement of a signal.
Timbre
The characteristic of a sound that sets it apart from other sounds with identical pitch and loudness.
Perception
The process by which individuals interpret and organize sensation to produce a meaningful experience of the world.
Loudness
A measurement of the perceived intensity or volume of sound by the human ear.
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