resting membrane potential


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Related to resting membrane potential: action potential

potential

 [po-ten´shal]
existing and ready for action, but not active.
electric tension or pressure.
action potential see action potential.
after-potential the period following termination of the spike potential.
auditory evoked potential in electroencephalography, changes in waves in response to sound; see also brainstem auditory evoked potential.
brainstem auditory evoked potential that portion of the auditory evoked potential that comes from the brainstem; abnormalities can be analyzed to evaluate comas, to support diagnosis of multiple sclerosis, and to detect early posterior fossa tumors.
cognitive event--related p's a diagnostic study that uses electroencephalographic equipment and a computer dedicated to analyze brain wave P300; this wave is a measure of the brain's active cognitive processing of information. The patient is instructed to complete a task that requires attention and information processing. A recording of brain wave activity as well as information related to cognitive function is produced.
diastolic potential the transmembrane potential of the cell during electrical diastole.
maximal diastolic potential the most negative level attained during the cardiac cycle by the cell membrane of a fiber that does not have a constant resting potential, occurring at the end of phase 3 of the action potential. In pacemaker cells this is a point of hyperpolarization.
membrane potential the electric potential that exists on the two sides of a membrane or across the wall of a cell.
resting potential (resting membrane potential) the difference in potential across the membrane of a cell when it is at rest, i.e., fully repolarized. In cardiac physiology this occurs during electrical diastole in pacemaker cells and continuously in nonpacemaker cells.
spike potential the initial, very large change in potential of the membrane of an excitable cell during excitation.
threshold potential the transmembrane potential that must be achieved before a membrane channel can open; it differs among the various cardiac membrane channels.
potential (omaha) in the omaha system, a problem modifier on the third level of the problem classification scheme, defined as the presence of health patterns, behaviors, or risk factors that may preclude optimal health even though specific signs and symptoms are absent.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

resting membrane potential

The voltage difference between the inside and the outside of a cell when no stimulus is applied.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in periodicals archive ?
Consequently, although the physiological roles of ERG channels have been defined in studies conducted on the heart and other excitable cells, it is thought that the density of these currents are considerably lower in comparison to cochlear nucleus neurons and these currents have a minimal effect on the levels of the resting membrane potential. In the light of all this information, even though it is possible to say that ERG channels were electrophysiologically detected in cochlear nucleus neurons, immunohistochemical studies and PCR studies should also be conducted to show the existence of these channels both at the protein and gene levels.
In addition, the resting membrane potential is indeed hyperpolarised, especially in NG and MT (Figure 13(d)).
Action potentials travel along the axon through depolarisation of the resting membrane potential. This occurs via opening of membrane Na channels allowing a large number of Na ions to rapidly move into the axon and some potassium (K) ions to exit via K channels.
Its effects appear, therefore, to reflect an action on membrane properties of B8 that are operative near its resting membrane potential. We propose that the progressive advance of the B8 Vm into a region of increased resistance during a train of EPSPs contributes to the enhanced summation of successive EPSPs and that the modulatory effects of GABA reflect an action that augments this intrinsic property.
Recordings from interneurons confirmed that HAL-induced GABA release must be from their terminals, as no change was detected in the resting membrane potential, input resistance, firing threshold or spike accommodation of interneurons bathed in HAL.
The equilibrium potentials of all the ions diffusing across a membrane contribute to the resting membrane potential. David Goldman (1943) and Hodgkin and Katz (1949) showed that at equilibrium the net flow of all ions through the membrane is zero and the equilibrium potential is determined by the permeability of the membrane to a given ion ([P.sub.j]) according to the following equation known as the Goldman-Hodgkin-Katz Equation: