The Nervous System: Membrane Potential

Front 1

Excitable cell, like neurons, are more permeable to ___ than to ___.

Back 1

K+, Na+

Front 2

How would an increase in the number of passive K+ channels affect the membrane permeability to K+?

Back 2

More positive

Front 3

How would an opening of voltage-gated K+ channels affect the membrane permeability to K+?

Back 3

More positive

Front 4

How would closing the voltage-gated K+ channels affect the membrane permeability to K+?

Back 4

More negative

Front 5

What acts as a chemical force that pushes K+ out of the cell?

Back 5

Concentration gradient

Front 6

What force tends to pull K+ back into the cell?

Back 6

Electrical gradient

Front 7

When the concentration and electrical gradient are equal and opposite in a cell permeable only to K+, what is this called?

Back 7

Equilibrium potential

Front 8

The equilibrium potential for K+ is at ___mV.

Back 8

-90mV

Front 9

In an excitable cell, also permeable to Na+ and Cl-, the concentration gradient and electrical gradient would both tend to move Na+ ___ the cell.

Back 9

Into

Front 10

Does the concentration gradient (oppose / promote) the movement of Cl- into the cell?

Back 10

Promote

Front 11

Does the electrical gradient (oppose / promote) the movement of Cl- into the cell?

Back 11

Oppose

Front 12

What is the resting membrane potential?

Back 12

-70mV

Front 13

What compensates for the leakage of Na+ and K+ ions?

Back 13

Na+/K+ pump