Movement of the membrane potential in the positive direction, from its normal negative level.

Change in the resting potential of the nerve cell membrane in the direction of the action potential; the inside of the membrane becomes more positive. See also action potential, resting potential.

A drop of the membrane potential of a neuron from its resting potential. The basis of neural excitation.

in neurophysiology, the reduction of voltage across a cell membrane; expressed as a movement toward less negative (more positive) voltages on the interior side of the cell membrane

Change in the cell's membrane potential where the interior becomes less negative (i.e., a shift towards zero)

a loss of polarity or polarization

a decrease i the polarization of an electrode.

lessen the difference between the inside and the outside. Having the difference approach zero. This occurs preceeding action potential.

Depolarization we call the phenomenon which the polarization of the wave being transmitted is been altered.

Change in membrane potential to a more positive potential. See Hyperpolarization.

Neurophysiology Vasomotor

A decrease in the potential difference across the cell membrane of a neuron. Most neurons depolarize in response to stimulation.

A decrease in the polarization of an electrode; the elimination or reduction of polarization by physical or chemical means; depolarization results in increased corrosion.

Change in polarization of a radar pulse as a result of multiple reflections from the terrain surface.

A change from a negative to a positive charge, generating an electrical wave (as in the production of the heartbeat).

The resting potential of a neuron is typically about -70 millivolts. This means that the inside of the neuron is about 70 millivolts more negative than the outside. Under this state the neuron is said to be polarized. When the neuron is stimulated and an action potential results the inside of the neuron briefly becomes positive relative to the outside of the neuron. When this occurs the neuron is said to have been depolarized.

The destruction, neutralization or change in direction of polarity (negative versus positive charge).

The sudden change in electrical potential from negative to slightly positive which occurs during phase O of the action potential. In the heart, electrical depolarization initiates the mechanical contraction. Waves of depolarization spread from cell to cell. When this occurs in the atria, a native P wave is seen on the EGG; when this occurs in the ventricles, this is seen as a native QRS complex on the EGG. Depolarization can also be initiated by a pacemaker output stimulus.

the reduction or reversal of the potential difference that exists across the cell membrane at rest

Movement of the membrane potential toward 0 mV; a decrease in polarization.

A process of changing the membrane potential from negative to more positive values. The sign of the potential refers to the inside of the cell. Depolarization causes action potentials in neurons and muscle cells. (See also hyperpolarization; op.). Depolarization is the result of inward currents carried by Na+ and Ca++ ions.

Change in the potential that normally exists across the plasma membrane of a cell at rest, resulting in a less negative membrane potential.

The process by which a polarized signal, for example, a radar signal, loses its original polarization as the result of scattering or of propagation through an anisotropic medium. The signal may experience a change of polarization, for example, from circular to elliptical as a result of differential attenuation or differential phase shift, or it may experience a loss of polarization, that is, become unpolarized, as a result of scattering in a random medium.

Change of the electrical polarity of a membrane because of flow of ion in and out of the cell across the cell membranes. In the heart in sinus rhythm, it is caused by electrical impulses arising from the SA node.

In biology, depolarization is a decrease in the absolute value of a cell's membrane potential. Thus, changes in membrane voltage in which the membrane potential becomes less positive or less negative are both depolarizations. The rising and falling phases of an action potential are often imprecisely called depolarization and hyperpolarization, respectively.