If there is an increase in extracellular K+ ion concentration, the result is
depolarization of the plasma membrane
If the permeability of the plasma membrane to K+ ions increases, the result is
hyperpolarization of the plasma membrane
If there is an increase in the extracellular Na+ ion concentration, the result is
little, if any, change in the resting membrane potential of the plasma membrane
Voltage-gated Na+ ion channels are sensitive to changes in the extracellular concentration of
Small depolarizations of the plasma membrane, regardless of the cause of the depolarization, cause
voltage-gated Na+ ion channels to open
When the plasma membrane is at rest, activation gates of the voltage-gated Na+ ion channels are __________ and inactivation gates are __________ .
When a nerve cell membrane changes from positive inside to negative inside, the cell membrane is undergoing
Which of the following statements is NOT true concerning the resting membrane potential?
Sodium ions are in relatively higher concentration inside the cell than outside.
During the repolarization phase of an action potential, which of the following is the primary activity?
Potassium ions are flowing out of the cell
During the depolarization phase of an action potential, which of the following situations exists?
The inside of the membrane is becoming more positive with respect to the outside.
The one-way nature of action potential propagation down an axon is primarily due to
the refractory period
The absolute refractory prevents the recently-depolarized portion of the membrane from depolarizing again
an action potential can only travel in one direction