concept 48.2: ion pumps and ion channels establish the resting potential of a neuron

membrane potential

a voltage across the plasma membrane in every cell

how are messages transmitted

as changes in the membrane potential

resting potential

the membrane potential of a neuron that is NOT sending signals, when the cell is at rest

action potentials

signals send through changes in membrane potential

describe the concentration of K+ in a mammalian neuron at resting potential

the concentration of K+ is higher INSIDE the cell

describe the concentration of Na+ in a mammalian neuron at resting potential

the concentration of Na+ is higher OUTSIDE the cell

sodium potassium pump

uses ATP to maintain the K+ and Na+ gradient across the plasma membrane

How much Na+ and K+ go in and out of the cell using a sodium- potassium pump

3 Na+ go out and 2 K+ fo in

is a sodium potassium pump active or passive transport

active transport

what kind of energy is represented by concentration gradients

chemical potential energy

the opening of ion channels in the plasma membrane converts what king of energy to what kind of energy

converts chemical potential energy to electrical potential

what is the resulting charge of a cell what provides membrane potential

negative charge