Outline and evaluate the research into the effect of stress on the immune system
Outline and evaluate the research into the effect of stress on the immune system
During strenuous times, our body undergoes many physiological changes in order to aid our survival, and this is an inherited function (Canon’s ‘fight or flight’ theory). Stress in small doses, in fact is needed and useful to humans, however long term stress can take its toll on the body. The General Adaptation Syndrome (GAS) model was developed by Selye to explain the effects of exposure to stressor. The GAS model consists of these 3 stages; Alarm – when our HPAC and SAM pathways are activated, causing stress related hormones like adrenaline and cortisol to be releases into blood, which in turn, converts to glucose, giving the body a sudden surge of energy, allowing ‘fight or flight’ like behaviours, until the stressor is gone and the parasympathetic nervous pathway activates, allowing us to calm down. Resistance – When the stressor remains however the person appears unaffected on the outside, but internally the stress related effects are occurring, e.g. stress hormones still being released and a continued elevation in heart rate. The resistance stage can harm health, as the immune system is not as effective. However the body attempts to resist disease. Further stressors make this much harder. Exhaustion – stressor still persists (and would now be referred to as Chronic stress) and Selye claimed that the body’s defences can no longer cope with the demands that are made, resources are drained, causing a drastic fall in blood sugar levels, and our adrenal glands no longer function properly. However this is inaccurate, which is a criticism of the GAS model, as while the body is ‘exhausted’ in terms of full ability, it could still perform if immediate action and release of energy was needed. It is also believed that many of the long lasting effects of raised stress hormones is what causes stress related illnesses, rather than the body’s sources being depleted. The study lacks ecological
During strenuous times, our body undergoes many physiological changes in order to aid our survival, and this is an inherited function (Canon’s ‘fight or flight’ theory). Stress in small doses, in fact is needed and useful to humans, however long term stress can take its toll on the body. The General Adaptation Syndrome (GAS) model was developed by Selye to explain the effects of exposure to stressor. The GAS model consists of these 3 stages; Alarm – when our HPAC and SAM pathways are activated, causing stress related hormones like adrenaline and cortisol to be releases into blood, which in turn, converts to glucose, giving the body a sudden surge of energy, allowing ‘fight or flight’ like behaviours, until the stressor is gone and the parasympathetic nervous pathway activates, allowing us to calm down. Resistance – When the stressor remains however the person appears unaffected on the outside, but internally the stress related effects are occurring, e.g. stress hormones still being released and a continued elevation in heart rate. The resistance stage can harm health, as the immune system is not as effective. However the body attempts to resist disease. Further stressors make this much harder. Exhaustion – stressor still persists (and would now be referred to as Chronic stress) and Selye claimed that the body’s defences can no longer cope with the demands that are made, resources are drained, causing a drastic fall in blood sugar levels, and our adrenal glands no longer function properly. However this is inaccurate, which is a criticism of the GAS model, as while the body is ‘exhausted’ in terms of full ability, it could still perform if immediate action and release of energy was needed. It is also believed that many of the long lasting effects of raised stress hormones is what causes stress related illnesses, rather than the body’s sources being depleted. The study lacks ecological