Jenna, Andrew, Mick, Lindsey
Period 2
Na/K Fun!
ANIMATION 1-3: SODIUM POTASSIUM PUMP
Your Results:
The correct answer for each question is indicated by a
1
CORRECT
.
The sodium-potassium pump functions to pump
A)sodium ions out of the cell and potassium ions into the
cell.
B)sodium ions into the cell and potassium ions out of the
cell.
C)sodium and potassium ions into the cell.
D)sodium and potassium ions out of the cell.
E)sodium and potassium ions in both directions across the
cell membrane.
2
CORRECT
What is the source of energy used to power the sodium-potassium
pump?
A)breakdown of ATP
B)formation of ATP
C)transport of ATP by the pump
D)breakdown of GTP
E)transport of GTP by the pump
3
CORRECT
During one cycle, the sodium-potassium pump binds and moves.
A)1 Na+ and 2 K+.
B)2 Na+ and 2 K+.
C)2 Na+ and 3 K+.
D)3 Na+ and 2 K+.
E)3 Na+ and 3 K+.
4
CORRECT
The sodium-potassium pump is a trans-membrane protein.
A)True
B)False
5
CORRECT
The binding and release of sodium or potassium ions are due to
conformational changes in the protein.
A)True
B)False
ANIMATION 4-5: CHEMICAL SYNAPSE
Your Results:
The correct answer for each question is indicated by a
1
CORRECT
.
An action potential arriving at the presynaptic terminal causes...
A)sodium ions to diffuse into the cell.
B)sodium ions to diffuse out of the cell.
C)calcium ions to diffuse into the cell.
D)acetylcholine to diffuse into the cell.
E)ligand-gated sodium channels to open.
2
CORRECT
As a result of question number one...
A)synaptic vessels migrate to the plasma membrane and
release acetylcholine.
B)acetylcholine is actively transported from the pre-synaptic
neuron.
C)acetylcholine is actively transported to the post synaptic
neuron.
D)ligand-gated sodium channels open.
E)sodium ions diffuse into the cell.
3
CORRECT
Acetylcholine has which effect on the post-synaptic neuron?
A)Ligand gated calcium channels open and calcium diffuses
in.
B)Ligand gated sodium channels open and sodium diffuses
in.
C)Terminal vessels migrate to the plasma membrane.
D)Voltage gated calcium ion channels open and calcium
diffuses in.
E)Voltage gated sodium ion channels open and sodium
diffuses in.
4
CORRECT
If the post-synaptic membrane potential reaches threshold level,
an action potential will be produced.
A)True
B)False
5
CORRECT
Acetylcholine is actively transported from the pre-synaptic
membrane to the post - synaptic membrane.
A)True
B)False
ANIMATION 6 : NERVE IMPULSE
Your Results:
The correct answer for each question is indicated by a
1
CORRECT
.
Which of the following statements about the resting membrane
potential is TRUE?
A)the exterior of the cell has a net negative charge and the
interior has a net positive charge
B)the exterior of the cell has a net negative charge and the
interior is neutral
C)the exterior of the cell has a net positive charge and the
interior has a net negative charge
D)the exterior of the cell has a net positive charge and the
interior is neutral
E)the exterior of the cell is neutral and the interior has a net
negative charge
2
CORRECT
During depolarization, which of the following statements about
voltage-gated ion channels is TRUE
A)K+ gates open before Na+ gates
B)Na+ gates open before K+ gates
C)Na+ and K+ gates open at the same time
D)Na+ gates open while K+ gates remain closed
E)K+ gates open while Na+ gates remain closed
3
CORRECT
Depolarization occurs because
A)more K+ diffuse into the cell than Na+ diffuse out of
B)more K+ diffuse out of the cell than Na+ diffuse into it
C)more Na+ diffuse into the cell than K+ diffuse out of it
D)more Na+ diffuse out of the cell than K+ diffuse into it
E)both Na+ and K+ diffuse into the cell
4
CORRECT
The sodium-potassium pump is involved in establishing the
resting membrane potential.
A)True
B)False
5
CORRECT
The nerve impulse is an electrical current that travels along
dendrites or axons.
A)True
B)False
ANIMATION 7 : TRANSMISSION ACROSS A SYNAPSE
Your Results:
The correct answer for each question is indicated by a
1
CORRECT
.
The primary neurotransmitter at the neuromuscular junction is
A)dopamine.
B)adrenaline.
C)acetylcholine.
D)histamine.
E)serotonin.
2
CORRECT
Arrange the following in the proper order in which they occur at
the pre-synaptic side of a neuromuscular junction.
1. Calcium ions are released
2. Action potential arrives at the presynaptic terminal
3. Neurotransmitter is released
A)1, 2, 3
B)2, 1, 3
C)2, 3, 1
D)3, 2, 1
E)3, 1, 2
3
CORRECT
Arrange the following in the proper order in which they occur at
the post-synaptic side of a neuromuscular junction.
1. Action potential is propagated over the muscle cell membrane
2. Depolarization of the post-synaptic membrane
3. Sodium ions move into muscle cell
A)1, 2, 3
B)2, 1, 3
C)2, 3, 1
D)3, 2, 1
E)3, 1, 2
4
CORRECT
The area between the pre-synaptic nerve cell and the postsynaptic muscle cell is termed the synaptic cleft.
A)True
B)False
5
CORRECT
Receptors that bind the neurotransmitter at the post-synaptic cell
membrane are voltage-gated.
A)True
B)False
ANIMATION 8-9: VOLTAGE GATED CHANNELS AND THE
ACTION POTENTIAL
Your Results:
The correct answer for each question is indicated by a
1
CORRECT
.
Depolarization occurs because...
A)potassium ions continue to diffuse out of the cell after the
inactivation gates of the voltage-gated sodium ion
channels begin to close.
B)the extra efflux of potassium ions causes the membrane
potential to become slightly more positive than the resting
value.
C)the increased potassium ion permeability lasts slightly
longer than the time required to bring the membrane
potential back to its resting level.
D)more sodium ions diffuse into the cell than potassium ions
diffuse out of it.
E)the inactivation gates of the voltage-gated sodium ion
channels begin to open and the diffusion of sodium ions
decreases.
2
CORRECT
Repolarization occurs because...
A)potassium ions continue to diffuse out of the cell after the
inactivation gates of the voltage-gated sodium ion
channels begin to close.
B)the extra efflux of potassium ions causes the membrane
potential to become slightly more positive than the resting
value.
C)the increased potassium ion permeability lasts slightly
longer than the time required to bring the membrane
potential back to its resting level.
D)more sodium ions diffuse into the cell than potassium ions
diffuse out of it.
E)the inactivation gates of the voltage-gated sodium ion
channels begin to open and the diffusion of sodium ions
decreases.
3
CORRECT
Hyperpolarization, or afterpotential occurs because...
A)potassium ions continue to diffuse out of the cell after the
inactivation gates of the voltage-gated sodium ion
channels begin to close.
B)the extra efflux of potassium ions causes the membrane
potential to become slightly more positive than the resting
value.
C)the increased potassium ion permeability lasts slightly
longer than the time required to bring the membrane
potential back to its resting level.
D)more sodium ions diffuse into the cell than potassium ions
diffuse out of it.
E)the inactivation gates of the voltage-gated sodium ion
channels begin to open and the diffusion of sodium ions
decreases.
4
CORRECT
After the passage of the action potential, the sodium-potassium
pump reestablishes the resting membrane potential.
A)True
B)False
5
CORRECT
The sodium-potassium pump uses bulk transport to move the
sodium and potassium ions.
A)True
B)False
ANIMATION 10-11: ACTION POTENTIAL
Your Results:
The correct answer for each question is indicated by a
1
CORRECT
.
An action potential
A)prevents the neuron cell membrane from altering its
charge.
B)causes the inside of the neuron cell membrane to become
positive and the outside negative.
C)causes the inside of the neuron cell membrane to become
positive and the outside neutral.
D)causes the outside of the neuron cell membrane to
become positive and the inside negative.
E)causes the outside of the neuron cell membrane to become
positive and the inside neutral.
2
CORRECT
An action potential generates local currents that tend to
________ the membrane immediately adjacent to the action
potential.
A)depolarize
B)repolarize
C)hyperpolarize
D)stabilize
E)neutralize
3
CORRECT
The absolute refractory period is the period of time during which
A)a second action potential cannot be generated.
B)a second action potential is generated.
C)the action potential ceases.
D)the action potential decreases in magnitude.
E)the action potential changes direction.
4
CORRECT
Action potential propagation occurs in both directions along the
axon.
A)True
B)False
5
CORRECT
Threshold is the minimum current required for the cell membrane
to generate an action potential.
A)True
B)False