membrane potential

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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.

mem·brane po·ten·tial

the potential inside a cell membrane, measured relative to the fluid just outside; it is negative under resting conditions and becomes positive during an action potential.

membrane potential

Electrical potential due to the differences in the concentrations of ions on either side of a semipermeable membrane.

membrane potential

Cardiology The voltage difference between the inside and outside of resting excitable–neurons and muscle, not-yet depolarized cells

mem·brane po·ten·tial

(mem'brān pŏ-ten'shăl)
The potential inside a cell membrane, measured relative to the fluid just outside; it is negative under resting conditions and becomes positive during an action potential.

membrane potential

The difference in millivoltage between one side of a membrane and the other.

membrane potential

the potential difference between the two sides of a cell membrane. see NERVE IMPULSE.
References in periodicals archive ?
It is ever believed that neuron is the most important basic unit of nerve system, and many experimental evidences have confirmed that gliocyte, particularly, astrocyte, can play an important role in changing the fluctuation of membrane potential of neuron by adjusting the concentration of [Ca.sup.2+] via [IP.sub.3] (inositol triphosphate) [1-3].
(a) IV" curves and membrane potentials recorded after 1 h of incubation in control conditions (grey line), after stimulation of TREK-1 current by 10 [micro]M of arachidonic acid (AA) (dark grey line) and in the presence of 1 [micro]M SPA (dark line).
We observed the change of the action potential duration (APD) and the resting membrane potential (RMP) after 5 mins of drug application, when the action potential of cardiomyocytes becomes steady.
TRP is an 'electrochemical diode' which rectifies ionic transport through the membrane and is loaded in the closing direction under standard (resting, negative membrane potential, cell is positive outside) physiological conditions.
(1) We investigated well-known parameters such as cell cycle distribution, mitochondrial membrane potential, DNA fragmentation, expression of Bax and Bcl-2 proteins, and activation of caspases.
They concluded that in these C-fiber nociceptors the TREK2 keeps membrane potentials more negative, stabilizing their membrane potential, reducing firing and thus limiting the amount of spontaneous burning pain.
To illustrate the state changing of the whole network, we use the changing of average membrane potential to describe the changing of local field potential (LFP), which means that we average membrane potentials of every neuron in the network to express LFP.
A common use of this treatment is to assist neurons in firing action potentials (APs) by increasing their resting membrane potential. Current biomedical research continues to demonstrate the benefits of tDCS as a medical treatment.
Interstitial cells of Cajal (ICCs) are the pacemaking cells in the gastrointestinal (GI) muscles that generate the rhythmic oscillations in the membrane potential known as slow waves [1-3].
All cells have an electrical state called a membrane potential, created when there is a different concentration of electrically charged atoms called ions outside and inside the cell.
The activity-dependent short-term plasticity of EPSPs originating from B20 was further examined in experiments in which the postsynaptic membrane potentials of B16 and B8 were set to hyperpolarized levels.
Connelly found that autapse enhances the synchrony of basket cell membrane potentials across the network during neocortical gamma oscillations [18].

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