Answer:
Adrenaline
Explanation:
Adrenaline, also called norepinephrine, is a hormone produced mainly by the adrenal glands (medulla). Its main goal is to prepare the body to <em>“fight or flight”</em> response, it means that under <u>stressful situations </u>(in this case, fear), it triggers heart rate increase, airway expansion (to benefit gas exchange), blood pressure increase, mydriasis, etc.
Adrenaline release is stimulated by the sympathetic nervous system.
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