PSL 425 UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS
What is the driving force that determines the passive The electrochemical gradient
transport of solutes across a permeable membrane?
When a substance is uncharged, as in the case of Only when the concentration is equal on the two sides of the membrane
glucose, when can equilibrium occur?
, If neither the chemical nor the electrical term in the The two terms are equal but of opposite sign
electrochemical potential energy difference equation is
zero, when can equilibrium occur?
Which of the following values is unnecessary when The membrane voltage
finding the equilibrium potential of an ion using the
Nernst equation?
What does the Nernst equation predict for any The equilibrium potential
concentration gradient of a particular ion across a
membrane?
If movement of a substance across the membrane is not Noncoupled transport
directly coupled to the movement of any other solute or
to any other chemical reaction, this transport is called?
How is the net flux best determined in terms of influx and The sum of influx and efflux
efflux?
What direction will an anion move when the net driving The anion will exit the cell
force is negative?
What direction will a cation move when the net driving The cation will enter the cell
force is negative?
For equilibrium to occur what must happen? The net flux must be zero
Which answer correctly orders the Nernst potentials of a Ca2+ > Na+ > Cl- > K+
neuron at 37°C for potassium, sodium, calcium, chloride
from depolarized to hyperpolarized?
The resting membrane potential is mainly determined by: The potassium gradient
What is the name for the movement of a single ion Current
species through the membrane?
What does the rate of ion movement through the The external and internal concentrations of the ion
membrane depend on? The membrane potential
The permeability coefficient of the ion
The outward flow of Cl- would best be described as a(n): Inward current
The inward flow of Na+ would best be described as a(n): Negative current
If the membrane is permeable to multiple monovalent Sum
ions and only these ions, the total ionic current would be
the _____of the individual ionic currents.
Coulomb's law explains what physical phenomenon? Attractive and repulsive electrostatic forces between two charged particles
What is the driving force that determines the passive The electrochemical gradient
transport of solutes across a permeable membrane?
When a substance is uncharged, as in the case of Only when the concentration is equal on the two sides of the membrane
glucose, when can equilibrium occur?
, If neither the chemical nor the electrical term in the The two terms are equal but of opposite sign
electrochemical potential energy difference equation is
zero, when can equilibrium occur?
Which of the following values is unnecessary when The membrane voltage
finding the equilibrium potential of an ion using the
Nernst equation?
What does the Nernst equation predict for any The equilibrium potential
concentration gradient of a particular ion across a
membrane?
If movement of a substance across the membrane is not Noncoupled transport
directly coupled to the movement of any other solute or
to any other chemical reaction, this transport is called?
How is the net flux best determined in terms of influx and The sum of influx and efflux
efflux?
What direction will an anion move when the net driving The anion will exit the cell
force is negative?
What direction will a cation move when the net driving The cation will enter the cell
force is negative?
For equilibrium to occur what must happen? The net flux must be zero
Which answer correctly orders the Nernst potentials of a Ca2+ > Na+ > Cl- > K+
neuron at 37°C for potassium, sodium, calcium, chloride
from depolarized to hyperpolarized?
The resting membrane potential is mainly determined by: The potassium gradient
What is the name for the movement of a single ion Current
species through the membrane?
What does the rate of ion movement through the The external and internal concentrations of the ion
membrane depend on? The membrane potential
The permeability coefficient of the ion
The outward flow of Cl- would best be described as a(n): Inward current
The inward flow of Na+ would best be described as a(n): Negative current
If the membrane is permeable to multiple monovalent Sum
ions and only these ions, the total ionic current would be
the _____of the individual ionic currents.
Coulomb's law explains what physical phenomenon? Attractive and repulsive electrostatic forces between two charged particles
