BIO 225 COMPREHENSIVE EXAMS UPDATED
QUESTIONS AND ANSWERS SURE A+
✔✔Cl- - ✔✔A cell will most likely hyperpolarize when ____ enters it.
a. Cl-
b. Na+
✔✔False, strength of stimulus does not affect strength of action potentials - ✔✔True or
False: A strong supra-threshold (above-threshold) stimulus would differ from a weak
supra-threshold stimulus because the stronger stimulus would induce higher peak
voltages for each action potential.
✔✔the stronger stimulus would in induce more frequent action potentials - ✔✔How
would a strong supra-threshold (above-threshold) stimulus differ from a weak supra-
threshold stimulus?
✔✔hyperpolarized - ✔✔If a neuron that has a resting membrane potential of -60 mV
suddenly experiences a change and is now at -65 mV, we could say this neuron has
been...
a. depolarized
b. hyperpolarized
c. repolarized
, ✔✔signal conduction - ✔✔The myelin sheath is found in the ______ region of the
neuron.
✔✔True - ✔✔True or False: Electronic spread is faster than action potential generation.
✔✔True - ✔✔True or False: Action potential conduction is governed by the cable
properties of the axon.
✔✔True - ✔✔True or false: Large-diameter axons conduct axon potentials faster than
small-diameter axons.
✔✔False - ✔✔True or False: Signals travel more slowly through the internodes of the
axon than at the nodes of Ranvier.
✔✔b. they have different amplitudes - ✔✔Which of the following is true of graded
potentials:
a. they travel over long distances
b. they have different amplitudes
c. they are found in the axons
d. they travel without decrement
✔✔the dendrites and cell body - ✔✔Where are graded potentials normally located?
✔✔True - ✔✔True or False: Graded potentials are proportional to the strength of the
stimulus; ie a small stimulus will have a small change in voltage, where a large stimulus
will have a large change in voltage.
✔✔depolarizing current flows in both directions within the axon - ✔✔When voltage-
gated Na+ channels open in the axon of a typical resting neuron:
a. depolarizing current within the axon flows unidirectionally from the open channel
toward the axon terminal
b. depolarizing current within the axon flows unidirectionally from the open channel
toward the cell body
c. depolarizing current flows in both directions within the axon
✔✔hyperpolarization - ✔✔What is the result an inhibitory neurotransmitter has on the
membrane potential?
✔✔the force of the concentration gradient is balanced by an opposing electrical gradient
- ✔✔When an ion is allowed to selectively cross the plasma membrane, it will flow down
its concentration gradient until:
a. the concentration of the ion inside the cell is equal to the concentration outside of the
cell
b. the cytoplasm is depleted of that ion
c. the force of the concentration gradient is balanced by an opposing electrical gradient
QUESTIONS AND ANSWERS SURE A+
✔✔Cl- - ✔✔A cell will most likely hyperpolarize when ____ enters it.
a. Cl-
b. Na+
✔✔False, strength of stimulus does not affect strength of action potentials - ✔✔True or
False: A strong supra-threshold (above-threshold) stimulus would differ from a weak
supra-threshold stimulus because the stronger stimulus would induce higher peak
voltages for each action potential.
✔✔the stronger stimulus would in induce more frequent action potentials - ✔✔How
would a strong supra-threshold (above-threshold) stimulus differ from a weak supra-
threshold stimulus?
✔✔hyperpolarized - ✔✔If a neuron that has a resting membrane potential of -60 mV
suddenly experiences a change and is now at -65 mV, we could say this neuron has
been...
a. depolarized
b. hyperpolarized
c. repolarized
, ✔✔signal conduction - ✔✔The myelin sheath is found in the ______ region of the
neuron.
✔✔True - ✔✔True or False: Electronic spread is faster than action potential generation.
✔✔True - ✔✔True or False: Action potential conduction is governed by the cable
properties of the axon.
✔✔True - ✔✔True or false: Large-diameter axons conduct axon potentials faster than
small-diameter axons.
✔✔False - ✔✔True or False: Signals travel more slowly through the internodes of the
axon than at the nodes of Ranvier.
✔✔b. they have different amplitudes - ✔✔Which of the following is true of graded
potentials:
a. they travel over long distances
b. they have different amplitudes
c. they are found in the axons
d. they travel without decrement
✔✔the dendrites and cell body - ✔✔Where are graded potentials normally located?
✔✔True - ✔✔True or False: Graded potentials are proportional to the strength of the
stimulus; ie a small stimulus will have a small change in voltage, where a large stimulus
will have a large change in voltage.
✔✔depolarizing current flows in both directions within the axon - ✔✔When voltage-
gated Na+ channels open in the axon of a typical resting neuron:
a. depolarizing current within the axon flows unidirectionally from the open channel
toward the axon terminal
b. depolarizing current within the axon flows unidirectionally from the open channel
toward the cell body
c. depolarizing current flows in both directions within the axon
✔✔hyperpolarization - ✔✔What is the result an inhibitory neurotransmitter has on the
membrane potential?
✔✔the force of the concentration gradient is balanced by an opposing electrical gradient
- ✔✔When an ion is allowed to selectively cross the plasma membrane, it will flow down
its concentration gradient until:
a. the concentration of the ion inside the cell is equal to the concentration outside of the
cell
b. the cytoplasm is depleted of that ion
c. the force of the concentration gradient is balanced by an opposing electrical gradient
