Nervous System Physiology FINAL EXAM GUIDE
2025
|MOST COMMON QUESTIONS WITH CORRECTLY
VERIFIED ANSWERS|ALREADY A+
GRADED|GUARANTEED PASS
The action potential changes the membrane potential from BLANK mV (resting) to BLANK mV
and back again to the resting membrane potential
This results from a change in membrane permeability first to BLANK and then to BLANK, due to
the opening of what type of ion channels? BLANK - -70, +30
Na+, K+, and voltage gated channels
Where is the density of voltage gated Na+ channels the greatest? BLANK
What areas of the neuron generate signals that operate these voltage- gated channels? BLANK -
axon hillock
Dendrites and cell body
If the membrane reaches the trigger point known as BLANK, what electrical potential will be
generated? BLANK
,During the depolarization phase, voltage-gated BLANK channels open and BLANK -
Threshold, action potential
Na+, Na+
What are the two processes that stop the potential from rising above +30? - inactivation
of voltage gated Na+ channels
Opening of voltage gated potassium channels
the opening of voltage-gated K+ channels cause the membrane to BLANK? Does K+ move into
our out of the cell? BLANK if the membrane potential becomes more negative than -70 mV this
is called BLANK? This potential is caused by what characteristic of K+ permeability? BLANK -
repolarize, Out of, hyperpolarization, Slow decline of K+ permiability
After an action potential, the neuron cannot generate another action potential because BLANK
channels are inactive. This period is called the BLANK period? - Na+, absolute refractory
During the BLANK period, the cell can generate another action potential but only if the
membrane is BLANK depolarized? - Relative Refractory, More
Conduction velocity along the axon is increased by what two characteristics? - axon
diameter (long= increased velocity)
Mylenation
Conduction along a myelinated axon is called BLANK conduction. - Saltatory
Channels can be classified as either gated or nongated channels. A sodium channel that is
always open would be classified as a/ an BLANK channel - non-gated
Would sodium ions move into or out of the neurons through these channels? - in to
The presence of what ion inside the cell causes synaptic vesicles to fuse with the membrane? -
Ca2+
What is the name for the chemicals stored in the synaptic vesicles? BLANK What do these
chemicals diffuse across? BLANK Where do these chemicals bind to receptors? BLANK -
neurotransmitter, synaptic cleft, post-synaptic cell membrane
, What compensates from the movement (leakage) of Na+ and K+ ions? - sodium
potassium pump
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
Extracellular fluid concentration of K+ - Positive
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
I extracellular fluid concentration of K+
V- Negative
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
Extracellular fluid concentration of Na+ - Positive
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
I numver of passive Na+ channels
V- Positive
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
open voltage-gated K+ channels - Negative
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
open voltage-gated Na+ channels - Positive
2025
|MOST COMMON QUESTIONS WITH CORRECTLY
VERIFIED ANSWERS|ALREADY A+
GRADED|GUARANTEED PASS
The action potential changes the membrane potential from BLANK mV (resting) to BLANK mV
and back again to the resting membrane potential
This results from a change in membrane permeability first to BLANK and then to BLANK, due to
the opening of what type of ion channels? BLANK - -70, +30
Na+, K+, and voltage gated channels
Where is the density of voltage gated Na+ channels the greatest? BLANK
What areas of the neuron generate signals that operate these voltage- gated channels? BLANK -
axon hillock
Dendrites and cell body
If the membrane reaches the trigger point known as BLANK, what electrical potential will be
generated? BLANK
,During the depolarization phase, voltage-gated BLANK channels open and BLANK -
Threshold, action potential
Na+, Na+
What are the two processes that stop the potential from rising above +30? - inactivation
of voltage gated Na+ channels
Opening of voltage gated potassium channels
the opening of voltage-gated K+ channels cause the membrane to BLANK? Does K+ move into
our out of the cell? BLANK if the membrane potential becomes more negative than -70 mV this
is called BLANK? This potential is caused by what characteristic of K+ permeability? BLANK -
repolarize, Out of, hyperpolarization, Slow decline of K+ permiability
After an action potential, the neuron cannot generate another action potential because BLANK
channels are inactive. This period is called the BLANK period? - Na+, absolute refractory
During the BLANK period, the cell can generate another action potential but only if the
membrane is BLANK depolarized? - Relative Refractory, More
Conduction velocity along the axon is increased by what two characteristics? - axon
diameter (long= increased velocity)
Mylenation
Conduction along a myelinated axon is called BLANK conduction. - Saltatory
Channels can be classified as either gated or nongated channels. A sodium channel that is
always open would be classified as a/ an BLANK channel - non-gated
Would sodium ions move into or out of the neurons through these channels? - in to
The presence of what ion inside the cell causes synaptic vesicles to fuse with the membrane? -
Ca2+
What is the name for the chemicals stored in the synaptic vesicles? BLANK What do these
chemicals diffuse across? BLANK Where do these chemicals bind to receptors? BLANK -
neurotransmitter, synaptic cleft, post-synaptic cell membrane
, What compensates from the movement (leakage) of Na+ and K+ ions? - sodium
potassium pump
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
Extracellular fluid concentration of K+ - Positive
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
I extracellular fluid concentration of K+
V- Negative
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
Extracellular fluid concentration of Na+ - Positive
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
I numver of passive Na+ channels
V- Positive
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
open voltage-gated K+ channels - Negative
What will happen to the resting membrane potential of an excitable cell if (write positive or
negative to indicate which way the membrane potential would change.)
open voltage-gated Na+ channels - Positive
