The resting membrane potential of intestinal epithelial cells is approximately -70 mV, which means that the electric potential of the cytosolic surface of the plasma membrane is approximately 70 mV more negative than that of the outer extracellular surface of the plasma membrane. Suppose that the intestinal cell membrane became suddenly permeable to sodium ions. Which of the following is MOST likely to occur as a result? A.There will be a net flux of sodium ions into the cell.B.There will be a net flux of sodium ions out of the cell.C.There will be no net flux of sodium ions into or out of the cell.D.It is impossible to determine with the information given.

Potassium and sodium ions play an important role in resting membrane potential. Which ion has the larger concentration inside the cell?Multiple choice question.SodiumPotassium

Reestablishment of the resting membrane potential occurs throughMultiple ChoiceActive transport of sodium and potassium ionsDiffusion of sodium and potassium ionsActive transport of only sodium ionsActive transport of only potassium ions

The membrane potential at which voltage-gated sodium channels open is called .

Which of the following statements best describes the movement of ions across the plasma membrane?Multiple ChoiceMovement of K+ ions depends on the concentration of Na+ ions to either side of the membrane.The ion channels contributing to the membrane potential are unidirectional.The membrane potential is contributed to only by ions with a positive charge.Each ion species follows its own diffusion gradient, regardless of differences in the concentration of other ion species.

The resting membrane potential depends on two main factors that influence the magnitude and direction of Na+ and K+ diffusion across the plasmid membrane.What are these two factors?