Assertion: axon's segment | /r/CapableOf | allow more sodium ions
Facets:
value: in
type: LOCATION
Source sentences:
text: If enough quantity of sodium ions reach the axon hillock to raise the membrane potential at that point to a threshold value of about -55mV(the trigger voltage), this is sufficient to open voltage-gated sodium ion pores in the initial segment of the axon, which allows more sodium ions in, raising the membrane voltage to from 50mV to 100mV (called depolarization), which cause nearby v-gated Na ion pores to open, which lets in more sodium ions, which open successive v-gated ion pores along the length of the axon.