Outline And Evaluate Stress And Immune System

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Outline and evaluate research into Stress and the Immune System Stress is the feeling of being under too much mental or emotional pressure, and is experienced when a person's perceived environmental, social, and physical demands exceed their perceived ability to cope. Stress itself is not an illness but can cause an illness if not tackled. By being stressed, it leads to an increase in cortisol (a hormone produced by the adrenal gland), and this increase in cortisol leads to a decrease in immune system functioning, which therefore leads to several illnesses. The main function of the immune system is to protect the body from infectious agents such as viruses and other toxins. In support of this theory, a natural experiment was carried out by Kiecolt Glasser et al in 1984. Kiecolt Glasser et al. investigated whether stress had an effect on the immune system functioning. The researcher took blood samples from 75 first year medical students, all of whom were volunteers. Blood samples were taken one month before their final examinations, and during their examinations. Immune functioning was assessed by measuring NK cell activity in the blood samples. Results showed that the blood samples taken before the exam contained more NK cells compared to the blood samples taken during the exam. This suggests that stress leads to a weaker immune system, which results in vulnerability to illnesses. Immune changes have also seen to have shown a dramatic effect on the rate at which wounds heal. A study of students suggests that even the most predictable and relatively mild stress of examinations can have significant consequences for skin repair and wound healing. In a study carried out by Marucha et al in 1998, 11 students had been given a punch biopsy either during the holidays or three days before an exam. Results show that the wounds given before exams took 40% longer to
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