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.

The removal or depletion of ions in the thin boundary layer adjacent to a membrane or pipe wall.

An electrical state in an excitable cell whereby the inside of the cell is made less negative relative to the outside than at the resting membrane potential. A neuron membrane is depolarized if a stim [..]

1815; see de- + polarization. Related: Depolarize; depolarized.

A change in electricity in the heart caused by an electrical impulse and resulting in contraction of individual myocardial cells.

A reduction in the potential of a cell, usually a neuron. See action potential. Compare hyperpolarisation.

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 experi [..]

Reducing or randomizing the polarization of an electromagnetic wave. Note: Depolarization may be caused by transmission through a nonhomogeneous medium or a depolarizer. 2. Prevention of polarization in an electric cell or battery.

nerve impulses (pop)

A cell membrane is a protective barrier that encloses a cell and allows nutrients and waste to pass back and forth. The cell membrane has passageways that allow for the transport of things from the in [..]

A reduction in membrane potential (the interior of the neuron becomes less negative). See Figure 3.5. Compare hyperpolarization.

(n) a loss of polarity or polarization

The act of depriving of polarity, or the result of such action; reduction to an unpolarized condition.