Unit 3 AOS 1 (Nervous System) Flashcards
what is the central ns comprised of
the brain and spinal chord
what is the peripheral ns comprised of
muscles, nerves, and organs
what is the central ns job
receive sensory info from body and process it
what is an afferent message
a message sent towards the brain (sensory)
what is a efferent message
a message sent from the brain (motor)
what are the devisions of the peripheral ns
somatic nervous system and the autonomic ns
what are the devisions of the ans
sympathetic ns, enteric ns, parasympathetic ns
what does the somatic ns do with an example
controls voluntary movement e.g. take off jumper
what does the autonomic ns do give an example
invouluntary movement e.g. heart rate
what does the sympathetic ns do
activated under stress or threat o prepare the body for action e.g. increase heart rate, cotract bladeder, dialate pupils
what does the parasympathetic ns do
calms body down after stress returns it to homestasis e.g. pupils constrict, stimulates digestion
what does the enteric ns do
responsible for process of digestion- dopamine and digestion produced here as well
what is a neurotransmitter
chemical message passed through synapses that increases/decreases the likelihood of the post synaptic neuron firing its action potential
what are the types of neurotransmitters
inhibitory and excitatory
what is an inhibitory neurotransmitter what is an example
chemical message that makes post synaptic neuron less likely to fire action potential e.g. gaba
what is an excitatory neurotransmitter what is an example
chemical message that makes post synaptic neuron more likely to fire action potential e.g. glutamate
what does gaba do
gaba is inhibitory it has a calming effect
what does glutamate do
it is excitatory it is essential for memory and learning formation
what are neuromodulators
chemicl messages that affect multiple post synaptoc neurons
what does dopamine do
helps with smooth coordinated movements. motivates behaviour in pursuit of a reward. helps with memory mood and sleep
what are the inhibitory affects of dopamine
decreases impulse control and logical thinking. it can lead to feeling of euphoria motivating us to repeat behaviors in the future
what does seratonin do
serves an important function in regulating mood sleep and responses to pain. it is needed to stay calm and positive. low levels are linked to depression and anxiety
what are the differences between neuromodulators and neuro transmitters
neuromodulators are slow actong and long lasting, they affect multiple neurons neurotransmitters are fast acting and short lived they affect only one neuron
