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 plasma membrane of an excitable cell is more permeable to potassium ions becauseMultiple Choiceprotein molecules cannot exit through the cell membrane.calcium ions block Na+ and Cl- channels.of its positive electrical charge.there are more leak channels for K+ than Na+.there are more gated channels for K+.

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?

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

.How do potassium ions primarily enter animal cells?a.Active transport by sodium-potassium pumpb.Passive diffusion through the lipid bilayerc.Facilitated diffusion through channel proteins

Choose characteristics of the sodium-potassium ion pump.Multiple select question.Pumps sodium out of the cell against its concentration gradientUses ATPIs an example of passive transportPumps potassium along its concentration gradient