membrane depolarization


membrane depolarization

Dictionary of molecular biology. 2004.

Look at other dictionaries:

  • Membrane potential — Differences in concentration of ions on opposite sides of a cellular membrane lead to a voltage called the membrane potential. Many ions have a concentration gradient across the membrane, including potassium (K+), which is at a high inside and a… …   Wikipedia

  • Depolarization-induced suppression of inhibition — (DSI) is the classical and original electrophysiological example of endocannabinoid function in the central nervous system. Prior to the demonstration that DSI was dependent on the cannabinoid CB1 receptor function, there was no way of producing… …   Wikipedia

  • Depolarization (disambiguation) — Depolarization or depolarizer may refer to: Depolarization, a decrease in the absolute value of a cell s membrane potential Depolarizer, a substance used to depolarize an electrochemical cell Depolarization ratio, the intensity ratio between the… …   Wikipedia

  • Depolarization — For other uses, see Depolarization (disambiguation). Neuroscience portal In biology, depolarization is a change in a cell s membrane potential, making it more positive, or less negative. In neurons and some other cells, a large enough… …   Wikipedia

  • depolarization — 1. A relative reduction in magnitude of polarization; in nerve cells, d. may result from an increase in the permeability of the cell membrane to sodium ions. 2. The destruction, neutralization, or change in direction of …   Medical dictionary

  • depolarization — n. the sudden surge of charged particles across the membrane of a nerve cell or a muscle cell that accompanies a physicochemical change in the membrane and cancels out, or reverses, its resting potential to produce an action potential. The… …   The new mediacal dictionary

  • depolarization block — failure of an excitable cell to respond to a stimulus, because the membrane is depolarized …   Medical dictionary

  • Diastolic depolarization — In mammals cardiac electrical activity originates from specialized myocytes of the sinoatrial node (SAN) which generate spontaneous and rhythmic action potentials (AP). The unique functional aspect of this type of myocyte is the absence of a… …   Wikipedia

  • phase 4 depolarization — the slow reduction of the membrane potential of heart muscle cells during phase 4 (electrical diastole); it is normal in pacemaker cells but sometimes abnormally accelerated …   Medical dictionary

  • Myogenic contraction — refers to a contraction initiated by the myocyte cell itself instead of an outside occurrence or stimulus such as nerve innervation. Contents 1 Mechanisms 1.1 Unstable Membrane Potentials 1.1.1 Slow wave potentials …   Wikipedia


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