A&P notes 3-6-25

Cell membrane polarization

The difference in electric charge across the cell membrane, typically measured in millivolts.

Resting potential

The state of a neuron when not transmitting signals, typically around -70mV.

Depolarization

The process that occurs when the cell membrane potential becomes less negative (e.g., from -70mV to -50mV).

Molecular level changes

Changes at the atomic or molecular scale that affect the properties of a substance, in this context, how ion movement alters membrane potential.

Ion channels

Proteins in the cell membrane that allow ions to pass through, playing a key role in changing membrane potential.

Electrochemical gradient

The combined difference in charge and concentration of ions across the cell membrane, influencing ion movement.

Action potential threshold

The level of depolarization that must be reached for a neuron to fire an action potential, typically around -55mV.