Graphs + Summation Deets

excitatory postsynaptic

potential

opens Na+ channel

excitatory postsynaptic

cell

Depolarization

inhibitory postsynaptic

potential

opens k+ channel

inhibitory postsynaptic

cell

hyperpolarization

threshold

voltage

excitatory post synaptic potentials move membrane closer

-55mv (will fire AP)

inhibitory postsynaptic potentials

move the membrane proteins away from threshold & can counter ESPSs

summation

ESPSs & IPSPs compete against each other for AP to counter at axon hillock

spatial summation

all pre-synaptic neurons fire at the same rate

temporal summation

extremely high rate of inhibitory

continuos conduction

time

unmyelinated neurons depolarize & repolarize Na+In/k+ out)

5 mi/h

saltatory conduction

time

significantly increases the conduction velocity

225 mi/hr