PSPs (post synaptic potentials) Flashcards
what is the most common excitatory synapse in the NS
glutametergic synapse
which ion channels does glutamate open
sodium
what happens to the charge inside the post synaptic neuron in an EPSP
becomes more positive (Na+ in) - closer to AP
what is the most common inhibitory synapse in the NS
GABAergic synapse
which ion channels does GABA open
chloride
what happens to the inside of the post synaptic neuron in an IPSP
more negative (Cl- in) - farther from AP
is an AP more likely to occur if the PSPs are closer or farther from the axon hillock
closer - less SA for ions to leak out (voltage maintained)
where do PSPs travel to
cell body to sum together
what is temporal summation
2 EPSPs in quick succession
why does temporal summation occur
quick succession allows no time for Na+ gates to inactivate - summates instead
when will EPSPs have less effect on each other
farther away in space and time
what is spatial summation
EPSPs that occur close together on an axon
(closer together = more effect)
