Question

what hormone triggers the fight-or-flight response?
○ rhesus factor
○ estrogen
○ cortisol
○ phenylketonuria
○ testosterone

Explanation:

The fight-or-flight response is a physiological reaction to stress. Cortisol, a steroid hormone released by the adrenal glands, is a key regulator of this response, helping to increase blood sugar, suppress non-essential bodily functions, and enhance energy availability for应对 stress. Other options: rhesus factor is a blood group antigen, estrogen and testosterone are sex hormones, and phenylketonuria is a genetic disorder—none trigger the fight-or-flight response.

Answer:

cortisol