PSL 425 Final Exam Questions UPDATED ACTUAL QUESTIONS AND CORRECT
ANSWERS
The resting membrane potential is mainly determined by: The potassium gradient
a. The sodium gradient
b. The chloride gradient
c. The potassium gradient
d. The calcium gradient
The net outward flow of chloride would best be Inward current
described as a:
a. Equilibrium Current
b. Inward current
c. Outward current
d. Positive Current
What does the Nernst Equation predict for any The equilibrium membrane potential
concentration gradient of a particular ion across a
membrane?
a. The resting membrane potential
b. The permeability of the ion
c. The equilibrium membrane potential
d. The charge of the ion
, When substance is uncharged, as in the case of glucose, Only when the concentration is equal on the two sides of the membrane
when can equilibrium occur?
a. Only when the concentration is equal on the two sides
of the membrane
b. Equilibrium can never occur in this instance
c. Only when the voltage different is zero
d. Only when the external concentration matches the
internal concentration of potassium
Which answer correctly orders the Nernst potentials of a Ca2+ > Na+ > Cl- > K+
cell at 37 C for potassium, sodium, calcium, and chloride
from depolarized to hyperpolarized?
a. Ca2+ > Na+ > Cl- > K+
b. K+ > Na+ > Ca2+ > Cl-
c. Na+ > Ca2+ > Cl- > K+
d. K+ > Ca2+ > Cl- > Na+
What is the name for the movement of a single ion Current
species through the membrane?
a. Charge
b. Resistance
c. Voltage
d. Current
What directions are the chemical driving force (CDF) and CDF out & EDF in
the electrical driving force (EDF) for a hypothetical
positive ion (X+) given values below:Extracellular
concentration [X-] = 15 mMIntracellular concentration [X-]
= 100 mMMembrane Voltage Vm = -60 mV
a. CDF in & EDF out
b. CDF in & EDF in
c. CDF out & EDF in
d. CDF out & EDF out
What would happen to the equilibrium potential of Hyperpolarize
potassium if the extracellular potassium concentration
decreased?
a. Repolarize
b. Depolarize
c. Hyperpolarize
d. Nothing
ANSWERS
The resting membrane potential is mainly determined by: The potassium gradient
a. The sodium gradient
b. The chloride gradient
c. The potassium gradient
d. The calcium gradient
The net outward flow of chloride would best be Inward current
described as a:
a. Equilibrium Current
b. Inward current
c. Outward current
d. Positive Current
What does the Nernst Equation predict for any The equilibrium membrane potential
concentration gradient of a particular ion across a
membrane?
a. The resting membrane potential
b. The permeability of the ion
c. The equilibrium membrane potential
d. The charge of the ion
, When substance is uncharged, as in the case of glucose, Only when the concentration is equal on the two sides of the membrane
when can equilibrium occur?
a. Only when the concentration is equal on the two sides
of the membrane
b. Equilibrium can never occur in this instance
c. Only when the voltage different is zero
d. Only when the external concentration matches the
internal concentration of potassium
Which answer correctly orders the Nernst potentials of a Ca2+ > Na+ > Cl- > K+
cell at 37 C for potassium, sodium, calcium, and chloride
from depolarized to hyperpolarized?
a. Ca2+ > Na+ > Cl- > K+
b. K+ > Na+ > Ca2+ > Cl-
c. Na+ > Ca2+ > Cl- > K+
d. K+ > Ca2+ > Cl- > Na+
What is the name for the movement of a single ion Current
species through the membrane?
a. Charge
b. Resistance
c. Voltage
d. Current
What directions are the chemical driving force (CDF) and CDF out & EDF in
the electrical driving force (EDF) for a hypothetical
positive ion (X+) given values below:Extracellular
concentration [X-] = 15 mMIntracellular concentration [X-]
= 100 mMMembrane Voltage Vm = -60 mV
a. CDF in & EDF out
b. CDF in & EDF in
c. CDF out & EDF in
d. CDF out & EDF out
What would happen to the equilibrium potential of Hyperpolarize
potassium if the extracellular potassium concentration
decreased?
a. Repolarize
b. Depolarize
c. Hyperpolarize
d. Nothing
