Fill in the Blanks StressOnline version Complete with the correct words. by Ilse Guzmán 1 You experience stress when you are in physical danger . During acute stress , the " fight or " reaction occurs . The brain adrenalin and cortisol . This your body and your reaction time : your heart faster , your breathing , and your muscles . Chronic stress , nonetheless , is different . The problem is that the brain does not stop the . Chronic stress can kill you , because the danger is not gone , it is : the fear and is in your mind .