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
