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The role of the reticular formation in arousal is that it is ____.? ?the single, critical system in arousing the cortex ?only one of several systems involved in arousal ?activated only by external stimuli ?activated only by internal stimuli

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BlueSky06

The second choice is correct.  The reticular formation is one of several systems involved in arousal.  The primary function of this interconnected nuclei in the brainstem are modulatory and premotor.  This is also divided into three columns which are the median, medial zone, and the lateral zone. 

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