Cocaine sometimes produces extreme alertness and an exaggerated awareness of environmental stimuli. This is because one of its effects is to enhance the activity of the neurotransmitter that helps prepare the body for stressful situations, namely:

The correct answer is- norepinephrine.

Explanation:

Norepinephrine is a hormone and also a neurotransmitter which is released from the adrenal medulla and with epinephrine it helps in generating the fight and flight response during the stress condition. Norepinephrine is synthesized from dopamine.

Cocaine binds to the structures which are known to regulate dopamine thereby it enhance the activity neurotransmitter norepinephrine which results in producing extreme alertness and exaggerated awareness and prepares our body for the stressful condition.

what's the question ?