What does the stress response begin with? O Shifting from a neutral posture to an offensive posture The release of chemical messengers, such as adrenaline, into the body The activation of the sympathetic nervous system O The release of high levels of cortisol into the system Identify the order in which your body takes the following steps in preparing to fight or flee. Body Response Step Releases glucose (blood sugar) and fatty acids into the bloodstream Suppresses the immune system as well as restorative and emergent processes Redirects blood to the brain and large-muscle groups Increases alertness through improved vision, hearing, and other sensory processes