help please~?

Question

Nerve impulses always move along a membrane away from the point of stimulation because the
A.refractory period is completed before the next wave of repolarization begins
B.repolarization of the membrane is faster than the wave of depolarization from one region to the next
C.wave of depolarization moves from one region to the next faster than the depolarizing area can complete its refractory period
D.sodium-potassium pump reverses the accumulation of ions slower than the depolarizing area can complete its refractory period

not sure???

Answer 1

I think C:

" ... this local depolarization [action potential=AP] gives rise to a passive spread of current up and down the axon, and this current in turn depolarizes adjacent regions ahead of the AP, bringing them to threshold and so generating an AP in a new region. As regions which have been excited are refractory, propagation of the AP is unidirectional."

Answer 2

hmmm...i had to read a few times but....i'm thinking-c also.

it explains more and the waves moves from one region to the next faster than the depolarizing area can complete its refractory period.

so yeah C

Answer 3

Neither am I :(
Just go with your instinct. Good luck!