week 4: neurobiology: parasympathetic and sympathetic NS Flashcards
two major divisions of autonomic NS
sympathetic and parasympathetic
sympathetic NS
prepares body to take action during times of threat, stress or excitement
fight or flight
parasympathetic NS
restores body during calm times
rest and digest system
where does sympathetic preganglionic neurone start
CNS
sympathetic: where does preganglionic neurone project to
sympathetic ganglion
(via preganglionic fiber)
length of sympathetic preganglionic fiber
quite short
as sympathetic ganglion is close to spinal cord (?)
sympathetic preganglion neurons release
acetylcholine
sympathetic: ganglionic neurones project to
target organs
sympathetic : postgangleonic neurons release
norepinephrine
sympathetic: norepinephrine
binds to recpetors on target organs
sympathetic: some cells release norepinephrine and epinephrine into
blood stream
act as hormones
bind to receptors throuhgout body
preganglionic neuron length of parasympathetic NS
longer ‘ganglia is much further away from spinal chord
ganglia is in periphery
parasympathetic: what neurotrasnmitters do preganglionic neurons release
acetylcholine
(similarity)
parasympathetic: what neurotransmitters do postganglionic neurone release
acetylcholine
why is it important different neurotransmitters are released at post ganglionic neurone
different effects on organs
