ES 342 - Chapter 2 - Review Questions
If the permeability of a resting (non-active) nerve cell to potassium ions is increased
while the permeability of the cell to sodium ions remains constant, the resting
membrane potential will...
A. Be unaffected
B. Depolarize
C. Hyperpolarize - correct answer Hyperpolarize - become more negative
Which of the following statements most accurately summarizes the resting
membrane potential?
A. It exists only when no ions are moving across the nerve membrane
B. It has as its primary cause potassium efflux
C. It has as its primary cause sodium efflux - correct answer B - potassium efflux
The RMP of a glial cell is...
A. Slightly more positive than the equilibrium potential for sodium
B. Slightly more negative than the equilibrium potential for potassium
C. Slightly more positive than the equilibrium potential for potassium
D. Equal to the equilibrium potential for potassium - correct answer D. Equal to the
equilibrium potential for potassium
The resting membrane potential of neurons is determined primarily by... - correct
answer Non gated K+ channels
The average concentration of Na+ in the extracellular space is... - correct answer
150 mmol /L H2O
