Stress is/stressors are: stimulus, response, & organism-environment interaction. Stressor-eliciting stimuli psychological or physical demands that endanger well being. Greater imbalance between demands & resources = more stressful a situation. Micro stressors daily hassles of everyday life. Catastrophic event unexpected w/large groups of people. Major negative events e. g. victim of a crime or sexual abuse. Stress response respond to situations as we perceive them. General adaption syndrome (selye) physiological response pattern to strong & prolonged stressors called. Alarm reaction helps body deal w/source of stress; shift to sympathetic dominance causes increased arousal. Resistance causes adrenal glands to release epinephrine, norepinephrine, & cortisol to maintain increased arousal. Exhaustion causes adrenal glands to lose ability to function normally. Clearest among people who have experienced catastrophic life events. Neuroticism heightened tendency to experience emotions to get them into stressful situations through maladaptive behaviour. Post-traumatic stress disorder caused by exposure to traumatic life events.