2. Fight-or-Flight Response and Hormonal Flood
Upon receiving an alert, the brain activates the nervous system (SAM axis) and the endocrine system (HPA axis). At this time, the body releases large amounts of stress hormones, such as adrenaline and cortisol, to survive . These hormones increase heart rate, raise blood sugar and blood pressure, send blood to the muscles, and put the body into a state of extreme tension.