action potential

English - Turkish

Definition of action potential in English Turkish dictionary

aksiyon potansiyeli

(Biyoloji) (Fizyoloji) Eylem potansiyeli, hareket potansiyeli, aksiyon potansiyeli. Tanım: Bir dürtünün kas ya da sınır hücresinin zarından geçmesi esnasında elektrik potansiyelinde olan değişiklik

(Pisikoloji, Ruhbilim) eylem potansiyeli

English - English

Definition of action potential in English English dictionary

A short term change in the electrical potential that travels along a cell such as a nerve or muscle fiber

(Biyoloji) In physiology, an action potential is a short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls, following a consistent trajectory

Nerve impulse; brief electrical signal that propagates along an axon or muscle fibre

The sudden change in electrical potential that travels down the axon of a neuron (Anderson)

The electrical part of a neuron's two-part, electrical-chemical message An action potential consists of a brief pulse of electrical current that travels along the axon to relay messages over long distances

A momentary change in electrical potential on the surface of a nerve or muscle cell that takes place when it is stimulated, especially by the transmission of a nerve impulse: Stimulating a nerve fiber causes an action potential to spread across the nerve cell, making it contract. Brief (about one-thousandth of a second) reversal of electric polarization of the membrane of a nerve or muscle cell. Stimulation of the cell by certain chemicals or by sensory receptor cells causes depolarization of the membrane, permitting an impulse to move along the nerve fibre (in nerve cells) or causing the cell to contract (in muscle cells)

An all-or-none membrane depolarization propagated along a nerve fiber without loss of amplitude

The changes in electrical potential generated by the muscle cell membrane or nerve cell tissue in response to intrinsic or extrinsic stimulation There are five phases: phase O is the period of rapid depolarization (polarity changes from negative to positive) and phases 1 through 4 return the cell to resting membrane potential

a reflection of the difference in the concentration of ions across a cell membrane at any given time

the local voltage change across the cell wall as a nerve impulse is transmitted

Cf {\em axon hillock}

Also known as nerve impulse or spike One generally talks about a cell "firing" or "generating" an action potential, or simply "spiking " An action potential is a brief change in membrane potential caused by the rapid opening and closing of transmembrane channels that pass specific ions through Action potentials travel along axons and transfer information over distance In this virtual lab, action potentials are generated in many of the cells you can find and appear as an almost vertical line superimposed on a horizontal oscilloscope trace The total number and the rate of firing of action potentials can encode information, as well as the actual shape of the action potential (some are longer lasting than others, as you can see in the lab) See Background on Nervous System for more details

A brief, regenerative, all-or-nothing electrical potential that propagates along an axon

Changes in electric potential on the membranes of living cells, resulting from cell stimulation, leading to an all-or-nothing action current (H) An abrupt change in the charge differential across the membrane of a nerve cell caused by a change in the permeability of the membrane to sodium ions; the nerve impulse [JA]

The electrical signal which rapidly propagates along the axon of nerve cells as well as over the surface of some muscle and glandular cells It is the result of a change in membrane electrical potential, the underlying cause of which is a change in flow of ions across the membrane due to voltage-activated ion channels

a relatively large amplitude, rapid change in potential across a cell membrane that occurs due to the regenerative activation of certain ionic channels when the potential exceeds a threshold coltage

  Is the result of a brief, localized change in the resting membrane potential When this change of resting potential is measured it can be visualized on an oscilloscope Action potentials are sometimes referred to as spikes or spike potentials

nerve impulse; transmission of a temporary voltage change down a nerve fibre

the brief, all-or-nothing change in membrane potential that constitutes a single response in a neurone

The electrical activity developed n a muscle or nerve cell curing activity; a neural impulse

a brief fluctuation in membrane potential caused by the rapid opening and closing of voltage-gated ion channels Action potentials sweep like a wave along axons to transfer information from one place to another in the nervous system

An electric nerve impulse that travels through a neuron when it is set off by a "trigger," changing the neuron's charge from negative to positive

a change in the electrochemical balance inside and outside a neuron; occurs when electrochemical stimulation of the neuron reaches or exceeds the neuron's threshold of excitation

The long-distance signal of the nervous system Action potentials are triggered in excitable cells in response to depolarization that exceeds the threshold potential

Occurs when a neuron is activated; the electrical state of its interior membrane temporarily changes from negative to positive The electrical charge travels along the axon to the terminal bud where it triggers or inhibits release of neurotransmitter into the synapse If sufficient transmitter substance is present at the synapse to initiate an action potential in the postsynaptic neuron, the impulse continues

A short duration, large, positive deflection of the membrane potential It is also sometimes referred to as a spike, because of it appearance in voltage traces The large positive membrane potential causes the neuron to release neurotransmitter, thus information transfer occurs with the action potential The action potential is the smallest quantum of information transfer

The firing on a neuron Occurs when the charge inside the neuron becomes more positive than the charge outside

Related Terms

action potentials

plural form of action potential

Hyphenation

ac·tion po·ten·tial

Turkish pronunciation

äkşın pıtenşıl

Pronunciation

/ˈaksʜən pəˈtensʜəl/ /ˈækʃən pəˈtɛnʃəl/