Zusammenfassung der Ressource
Biopsychology
- Nervous system
- Central nervous system
- Spinal cord
- - Relays information between
brain and body, allows
monitoring and contains nerve
cells to allow simple reflexes
- The brain
- Contains the cerebrum,
diencephalon, brain
stem and cerebellum
- Cerebrum is split
into 2
hemispheres
which
communicate
through the
corpus collosum
- Diencephalon
contains
hypothalamus and
thalamus where the
hypothalamus
regulates body temp,
hunger etc
- Brain stem regulates the
autonomic functions
such as breathing, heart
beat and swallowing
- Cerebellum monitors motor
skills, balance,
co-ordination
- Peripheral Nervous System
(relays nerve impulses from CNS
to the body and back)
- Somatic Nervous System
- - Has 12 pairs of cranial nerves
and 31 pairs of spinal nerves.
They both have sensory
neurons and are involved in
reflex actions
- Autonomic Nervous System
- Contains the sympathetic
branch (hypes up the body)
and the parasympathetic brain
(brings body back to normal)
- Sympathetic Branch - helps to
deal with flight or fight and
releases noradrenaline
- Parasympathetic Branch -
relaxes the body and
releases acetylcholine (rest
and digest)
- Neurons and Synaptic Transmission
- Structure and function of
neurons
- They carry neural
information and consist of
a cell body, dendrites and
an axon.
- Sensory Neurons carry
impulses from sensory
receptors TO the CNS
- Relay Neurons allow sensory and motor
neurons to communicate
- Motor Neurons form synapses with
muscles and control contractions
- Synaptic Transmission
- Is an electrical impulse (action potential)
arrives at end of axon. Crosses synaptic gap
and neurotransmitters are released. They
bind to receptors and produce excititary or
inhibitory effect.
- Excitatory Neurotransmitters
releases noradrenaline and is a
positive charge.
- Inhibitory Neurotransmitters
releases serotonin and has a
negative charge
- The Endocrine System
- A network of glands that manufacture
and secrete chemical messengers
known as hormones
- Signals are sent from the hypothalamus to the
piuitary gland in the form of a releasing
hormone. This causes the pituitary gland to
secrete a stimulating hormone into the
bloodstream.
- Too many hormones or too
little hormones at one time
can result in dsyfunction of
bodily systems
- Adrenal glands
- Adrenal glands sit on top of the
kidneys. It contains the adrenal
cortex (outer part) and the
adrenal medulla (inner part)
- Adrenal cortex produces
cortisol which controls
cardiovascular functions.
Adrenal medulla releases
adrenaline
- Pituitary
glands
- Pituitary glands produce hormones
whose primary function is to influence
the release of hormones to other glands.
It is the master gland and is controlled by
the hypothalamus
- Anterior hormones release ACTH as a
response to stress and posterior
hormones releases oxytocin to help
stimulate contractions in childbirth
- Fight or flight response
- Homeostasis is the tendency of
an organism to maintain an
internal equilibrium by
adjusting physiological
processes
- Amydgala TO hypothalamus TO autonomic
nervous system (sympathetic) TO adrenal
medulla - HANSAM
- Amydgala and Hypothalamus - brain area is
mobilised and a distress signal is given to
hypothalamus (acute and chronic stressors)
- Sympathetic Nervous System begins process of
preparing body for fight or flight and sends a signal to
the adrenal medulla which releases adrenaline and
noradrenaline
- Adrenaline makes the heart beats faster, pushes
blood to the muscles and triggers the release of
glucose to supply energy
- Parasympathetic Nervous System dampens
down the stress response and slows down
processes
- I; Gray argues that the first phase of
a reaction to a threat is not to fight
or flee but to avoid confrontation. J;
He suggested that many animals
show the 'freeze' response before
making a response and that this
response is essentially 'stop, look
and listen'. E; This shows that fight
or flight doesn't tell the whole story.
- I; Research shows that there are some negative consequences of
fight or flight. J; The problem arises when the stress response is
repeatedly activated, as the blood pressure is induced from the
SNS can damage blood vessels. E; This means that it is a problem
for modern day life
- I; Taylor suggested females behaviour response to stress is more
characterised by tend and befriend. J; Studies show there may be a
physiological response as the release of oxytocin in women
increases relaxation and makes them more nurturing. E; This shows
there are some gender differences.