Flashcards in Biopsychology Deck (22):
What is the CNS
Complex of nerve tissues that control activities in the body
What is the peripheral nervous system?
Nervous system outside the brain, sends nerve impulses from CNS to the rest of the body
Somatic nervous system
Sensory and motor neurons
Autonomic nervous system
Necessary for vital bodily functions, splits into the sympathetic and parasympathetic
Connected to muscles or glands, contains circuits of nerve cells that enable it to perform reflexes
Sympathetic nervous system:
Prepares body for intense activity,
Increased heart rate
Dilated blood vessels
Parasympathetic, relaxes body and inhibits processes
Reduces blood pressure
Slows breathing rate
Seratonin increases negative charge
On switch of nervous system, increase firing
Noradrenaline increases positive charge
Nervous system off switches, decrease likelihood of Neuton firing
What does the thyroid gland do?
Releases hormone that control metabolism
What does the adrenal gland do?
Releases adrenaline for fight or flight, cortisol increased at stress
Role of pancreas in endocrine
Secretes insulin, glycogen and controls digestion
What does the pituitary gland do.
Influences the realise of hormones LH FSH, oestrogen,
Men: sperm, progesterone and testosterone
What does the COMT gene regulate?
levels of dopamine, high levels of dopamine is more common in OCD
Faulty SERT gene
Leads to low levels of serotonin
concordance rate in MZ twins with twin study on schizophrenia
Concordance rate in DZ twins in schizophrenia study
Ranged from 9-26%
Evaluation points of biological approach to explaining OCD
Nestadt found that with 80 patients suffering from OCD a first degree relative was 5 times more likely to suffer themselves.
Concordance rate is not 100 in twins so there must be environmental factors
OCD is the form of expression of the same gene which determines Tourette's and autism showing there is no specific gene towards OCD but it a predisposing factor
What does SSRIS do?
Increase levels of serotonin released into the synapse
However cause headaches and insomnia
17 studies show that SSRIs perform better than placebos in reducing symptoms but this is only short term treatment
What do tricyclics do?
Blocks Neuron that reabsorbs serotonin so it's in the synapse for longer
Drugs require less effort, cheaper, require little monitoring
Reduce anxiety by slowing down activity of CNS and enhancing activity, reacts with GABA and makes it harder for neurons to be stimulated by neurotransmitters