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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.
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.
Synonym(s): transmembrane potential
Farlex Partner Medical Dictionary © Farlex 2012
membrane potentialElectrical potential due to the differences in the concentrations of ions on either side of a semipermeable membrane.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
membrane potentialCardiology The voltage difference between the inside and outside of resting excitable–neurons and muscle, not-yet depolarized cells
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
membrane potentialThe difference in millivoltage between one side of a membrane and the other.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
membrane potentialthe potential difference between the two sides of a cell membrane. see NERVE IMPULSE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005