resting 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.
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 potential

the electrical potential present between the inside and outside of a nerve or muscle fibre when in a resting state. The inside is negatively charged (-60 millivolts) and the outside positively charged. The membrane is polarized and the axon has a ‘resting potential’. Compare ACTION POTENTIAL.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
The membrane will become depolarized next to the initial site of depolarization, and the potential will increase (i.e., hyperpolarize) with distance away from the initial site of depolarization until the membrane potential is equal to the resting potential. This is known as electrotonic transmission.
Before we can understand the ionic basis of the action potential, we must first understand the ionic basis of the resting potential and ask, How do the ion concentrations in the cell and extracellular milieu affect membrane potential?
The results show that the photoreceptors have cell resting potentials of about -49 [+ or -] 7 mV and respond to a flash of light with a depolarization consisting of a transient component, often accompanied by a burst of action potentials, followed by a steady-state or plateau depolarization.
Resting potential was recorded during cell impalement and generator potentials were recorded in response to light flashes, before switching to current injection in these experiments.