Neurobiology Exam 1 QUESTIONS WITH |\ |\ |\ |\ |\
ANSWERS
The resting membrane potential of the neuron is about -70 mV.
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This is close to the equilibrium potential of which ion? - CORRECT
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ANSWERS ✔✔Potassium (K+)
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The length constant (λ) will be greater in a neuron with a: -
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CORRECT ANSWERS ✔✔large membrane resistance (Rm)
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An axon potential is initialed at the axon hillock. Besides
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occurring in a different location, what is the difference between
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an excitatory postsynaptic potential (EPSP) and an action
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potential? - CORRECT ANSWERS ✔✔Once the depolarization in
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voltage reaches a threshold, the action potential depolarizes
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rapidly in an all or nothing manner, whereas an EPSP is only a
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change in depolarization. |\ |\
With regard to movement of ions and the Nernst equation: -
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CORRECT ANSWERS ✔✔If the measured membrane potential
|\ |\ |\ |\ |\ |\ |\
equals the value calculated using the Nernst equation then there
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
will be no net movement of that ion.
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Functionally, the presence of myelin around an axon: - CORRECT |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔increases the conduction velocity of action
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potentials in that axon. |\ |\ |\
, A dendritic membrane with a large time constant (τ) and a small
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length constant (λ) will allow a postsynaptic potential to decay: -
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CORRECT ANSWERS ✔✔slowly, but spread only a short distance. |\ |\ |\ |\ |\ |\ |\ |\
While Dr. Huxley is recording the activity of a squid axon, he
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finds that a larger depolarizing shock is necessary on occasion in
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order to produce a new action potential. What is the most likely
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
explanation for Dr. Huxley's observations? - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\ |\
✔✔Dr. Huxley's second shock probably occurs during a relative
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refractory period. |\
Ignoring constants, it is accurate to say that the Goldman-
|\ |\ |\ |\ |\ |\ |\ |\ |\
Hodgkin-Katz (GHK) equation allows you to calculate the: - |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔membrane potential for a neuron, based |\ |\ |\ |\ |\ |\ |\ |\
on the concentrations and permeabilities of the major ions.
|\ |\ |\ |\ |\ |\ |\ |\
During the depolarizing (rising) phase of an action potential the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
current flow is dominated by an: - CORRECT ANSWERS ✔✔inward
|\ |\ |\ |\ |\ |\ |\ |\ |\
sodium (Na+) current.
|\ |\ |\
In general, flow of information in a neuron occurs in the following
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
manner: - CORRECT ANSWERS ✔✔Signals are received at the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
dendrites, processed in the cell body, and passed to other |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
neurons via the axon. |\ |\ |\
Which of the following is NOT an important factor in the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
generation of and recovery from an action potential in a squid |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
giant axon? - CORRECT ANSWERS ✔✔The influx of calcium
|\ |\ |\ |\ |\ |\ |\ |\ |\
(Ca2+)
ANSWERS
The resting membrane potential of the neuron is about -70 mV.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
This is close to the equilibrium potential of which ion? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Potassium (K+)
|\ |\ |\
The length constant (λ) will be greater in a neuron with a: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔large membrane resistance (Rm)
|\ |\ |\ |\ |\
An axon potential is initialed at the axon hillock. Besides
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
occurring in a different location, what is the difference between
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
an excitatory postsynaptic potential (EPSP) and an action
|\ |\ |\ |\ |\ |\ |\ |\
potential? - CORRECT ANSWERS ✔✔Once the depolarization in
|\ |\ |\ |\ |\ |\ |\ |\
voltage reaches a threshold, the action potential depolarizes
|\ |\ |\ |\ |\ |\ |\ |\
rapidly in an all or nothing manner, whereas an EPSP is only a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
change in depolarization. |\ |\
With regard to movement of ions and the Nernst equation: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔If the measured membrane potential
|\ |\ |\ |\ |\ |\ |\
equals the value calculated using the Nernst equation then there
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
will be no net movement of that ion.
|\ |\ |\ |\ |\ |\ |\
Functionally, the presence of myelin around an axon: - CORRECT |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔increases the conduction velocity of action
|\ |\ |\ |\ |\ |\ |\
potentials in that axon. |\ |\ |\
, A dendritic membrane with a large time constant (τ) and a small
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
length constant (λ) will allow a postsynaptic potential to decay: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔slowly, but spread only a short distance. |\ |\ |\ |\ |\ |\ |\ |\
While Dr. Huxley is recording the activity of a squid axon, he
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
finds that a larger depolarizing shock is necessary on occasion in
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
order to produce a new action potential. What is the most likely
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
explanation for Dr. Huxley's observations? - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\ |\
✔✔Dr. Huxley's second shock probably occurs during a relative
|\ |\ |\ |\ |\ |\ |\ |\ |\
refractory period. |\
Ignoring constants, it is accurate to say that the Goldman-
|\ |\ |\ |\ |\ |\ |\ |\ |\
Hodgkin-Katz (GHK) equation allows you to calculate the: - |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔membrane potential for a neuron, based |\ |\ |\ |\ |\ |\ |\ |\
on the concentrations and permeabilities of the major ions.
|\ |\ |\ |\ |\ |\ |\ |\
During the depolarizing (rising) phase of an action potential the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
current flow is dominated by an: - CORRECT ANSWERS ✔✔inward
|\ |\ |\ |\ |\ |\ |\ |\ |\
sodium (Na+) current.
|\ |\ |\
In general, flow of information in a neuron occurs in the following
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
manner: - CORRECT ANSWERS ✔✔Signals are received at the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
dendrites, processed in the cell body, and passed to other |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
neurons via the axon. |\ |\ |\
Which of the following is NOT an important factor in the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
generation of and recovery from an action potential in a squid |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
giant axon? - CORRECT ANSWERS ✔✔The influx of calcium
|\ |\ |\ |\ |\ |\ |\ |\ |\
(Ca2+)
