Nvq Level 3 Unit 8 D1

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The biological suggests that abnormality is down to four main factors: infection, neuroanatomy, biochemistry, and genetics. Infection is the result of pathogens entering the bloodstream and these pathogens cause diseases of the brain. For example, in the 1900s 3rd stage syphilis caused dementia and then death. Research has also shown a link between glandular fever and anorexia. The glandular fever damages the hypothalamus, which regulates hunger, so therefore causes the individual to develop anorexia. However the research was done on an extremely small sample size of only four people, so as a result there isn't enough evidence to support this theory. Genetics is the theory that you inherit a mental disorder from your parents because it's passed down to you in your genes. This theory has been tested by studying identical twins, also known as monozygotic or MZ twins. Biologists have studied twins with mental disorders to find out how likely it is that the other twin will also develop that disorder. They found that if one twin had anorexia then in 48% of cases so did the other twin, the percentage for depression was 46% and for schizophrenia it was 45%. These percentages are known as concordance rates. For this theory to be viable the concordance rates would need to be around 90% rather than around 50%. Just because a disorder runs in a family it doesn't mean it's been passed down in genes, it could have been learnt from the family environment. Some people would also argue that anorexia is a modern disorder so where would the gene…show more content…
People with depression are found to have low levels of serotonin in their brains and people with schizophrenia are found to have high levels of dopamine in their brains. However psychologists can't establish whether it's the change in chemicals which causes the abnormality or whether the abnormality changes the chemical
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