Pheochromocytoma produces symptoms of uncontrolled sympathetic nervous system activity. is common to both adrenal chromaffin cells and adrenergic fibers of the sympathetic nervous system.

Norepinephrine.

Explanation:

According to my research on studies conducted by various neurologists, I can say that based on the information provided within the question the term being described is called Norepinephrine. This is a neurotransmitter secreted by neurons in the sympathetic nervous system. This chemical is secreted in response to stress, which triggers the 'fight or flight response.' Which is basically the main triggers in Adrenaline within the sympathetic nervous system.

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