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Cell Membrane Potential and Ion Channels

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Cell Membrane Potential and Ion Channels

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Questions and Answers

What is the primary mechanism by which the membrane spanning ion channels contribute to the resting membrane potential?

By generating an electrochemical gradient

By actively pumping ions across the membrane

By maintaining unequal concentrations of sodium and potassium ions

By allowing the passage of cations through the channels (correct)

What would be the membrane potential if the membrane is only permeable to sodium?

0mV

+55mV (correct)

-55mV

-70mV

What is the net effect of the sodium/potassium pump on the membrane potential?

It makes the inside of the cell more positive

It makes the inside of the cell more negative (correct)

It has no direct effect on the membrane potential

It only affects the concentration of sodium ions

What is the term for the state of the cell when the inside is negatively charged with respect to the outside?

Polarization Signup and view all the answers

What determines the membrane permeability?

The presence of membrane spanning ion channels Signup and view all the answers

What would be the effect of a hyperpolarization on the membrane potential?

The inside of the cell becomes more negative Signup and view all the answers

What is the role of the sodium/potassium pump in establishing and maintaining the unequal distribution of sodium and potassium ions?

It maintains the unequal concentrations of sodium and potassium ions Signup and view all the answers

What is the equation that describes the membrane potential when the membrane is permeable to multiple ions?

Goldman-Hodgkin-Katz equation Signup and view all the answers

Why does the membrane potential not equal -65mV if the membrane is equally permeable to both sodium and potassium?

Because there is unequal permeability to sodium and potassium Signup and view all the answers

What is the term for the movement of ions down their electrochemical gradient?

Passive transport Signup and view all the answers