The Effects Of Stress On Homeostasis - 1820 Words

Assignment I Hans Selye was an endocrinologist who was considered the first scientist to study the effects of stress on homeostasis (6). He worked for John Hopkins, McGill University, and the University of Montreal (14). He first described his theory on general adaptation in 1936 and introduced the concepts of eustress and distress (6). According to Selye’s theory, stress is any factor that threatens homeostasis in an individual (6). He reasoned that there must be a generalized stress response without regards to the cause of stress (6). His generalized response to stress included three stages: alarm, resistance, and exhaustion (6). However, his theory was seen as too simple and many advances were made in the study of his theory on stress since his time. In Selye’s first letter on the concept of stress, he mentioned experiments in which the rats used displayed a common response to stress regardless of source (7). The response that he described included three different phases (7). I n the first phase of the response, Selye mentioned the observation of different symptoms in the rats after initial stress (7). The symptoms included a decrease in thymus, liver, spleen, and lymph gland size, a decrease in muscle size and body temperature, a loss of adipose tissue, edema, and digestive tract erosions (7). In the second stage, which is the resistance stage, all body systems returned to normal functioning (7). During the third stage, which is the exhaustion phase, resistance toShow MoreRelatedHow Does Stress Affect The Immune System?814 Words   |  4 PagesQuestion Set A: 1. When we experience stress, how is the endocrine system activated? How does it become deactivated? The stress response involved the HPA-hypothalamic-pituitary-adrenal axis. First, the hypothalamus activates the sympathetic nervous system. The adrenal gland then secretes epinephrine and norepinephrine, which increase heart rate. 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