nerve and synapses - action potential Flashcards
1
Q
graded potentials
A
help bring Vm closer to threshold, or further away
2
Q
refractory period
A
time dunning which the axon is resistant to generating a spike. it results from Na+ channels being inactive and unavailable.
3
Q
myelin (done by Schwann cell)
A
electrically insulating and mechanically supporting layer, form by plasma membrane of gilal cells
4
Q
nodes of ranvier
A
concentrated channels and pumps, have no myelin
5
Q
what does myelin do to speed
A
increases it
