QUÉ SIGNIFICA ACTION POTENTIAL EN INGLÉS
Potencial de acción
En fisiología, un potencial de acción es un evento de corta duración en el cual el potencial eléctrico de membrana de una célula aumenta y disminuye rápidamente, siguiendo una trayectoria consistente. Los potenciales de acción se producen en varios tipos de células animales, llamadas células excitables, que incluyen neuronas, células musculares y células endocrinas, así como en algunas células vegetales. En las neuronas, desempeñan un papel central en la comunicación de célula a célula. En otros tipos de células, su función principal es activar procesos intracelulares. En las células musculares, por ejemplo, un potencial de acción es el primer paso en la cadena de eventos que conduce a la contracción. En las células beta del páncreas, provocan la liberación de insulina. Los potenciales de acción en las neuronas también se conocen como "impulsos nerviosos" o "espigas", y la secuencia temporal de los potenciales de acción generados por una neurona se denomina su "tren de espigas". A menudo se dice que una neurona que emite un potencial de acción "dispara". Los potenciales de acción son generados por tipos especiales de canales de iones conectados a la tensión en la membrana plasmática de una célula.
definición de action potential en el diccionario inglés
La definición de potencial de acción en el diccionario es un cambio localizado en el potencial eléctrico, de aproximadamente -70 mV a +30 mV y viceversa, que ocurre a través de una fibra nerviosa durante la transmisión de un impulso nervioso.
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10 LIBROS DEL INGLÉS RELACIONADOS CON «ACTION POTENTIAL»
Descubre el uso de
action potential en la siguiente selección bibliográfica. Libros relacionados con
action potential y pequeños extractos de los mismos para contextualizar su uso en la literatura.
1
Human Physiology: From Cells to Systems
As with a graded potential, a single action potential involves only a small portion
of the total excitable cell membrane. Unlike graded potentials, however, ac- tion
potentials are conducted, or propagated, throughout the entire membrane in ...
2
Essential Medical Physiology
A frequently asked question is whether the flux of Naþ that occurs during the
action potential produces a concentration change on the inside of the cell.
Alternatively, because of the increase in Kþ permeability during an action
potential, there is ...
Leonard R. Johnson, John H. Byrne,
2003
3
Medical Phisiology: Principles for Clinical Medicine
Peak of action potential here Inward current 1 2 2 + + ++ + + + + + + + Axon
Depolarized region Direction of propagation A Glial cell Axon B Glial cell Axon
Action potential here Depolarizes node here C ○ Figure 3.8 Propagation of an
action ...
Rodney A. Rhoades, David R. Bell,
2012
4
Neurophysiological Basis of Movement
Action potential is probably the most important process in the human body
because it is used to transmit information over considerable distances within the
neuromuscular system. Its critical feature is propagation: An action potential
never ...
If, for example, we pass continuous depolarizing current into a neuron through a
microelectrode, we will generate not one, but many action potentials in
succession (Figure 4.2). (a) The rate of action potential generation depends on
the ...
Mark F. Bear, Barry W. Connors, Michael A. Paradiso,
2007
6
Nerve Cells and Nervous Systems: An Introduction to Neuroscience
Once an action potential is generated by opening of the voltage-gated Na"
channels, that part of the membrane where the potential exists is depolarised
compared with adjacent parts. The local depolarisation spreads, by means of the
passive ...
7
Principles and Methods of Toxicology, Fifth Edition
Molecular Basis of QT Prolongation Prolongation of QT intervals on
electrocardiograms is caused by prolongation of the action potential of ventricular
myocytes. For the cardiac action potential, phase 0 represents depolarization of
myocytes ...
8
Physiology: Cases and Problems
At low concentration, these drugs decrease the rate of rise of the upstroke of the
action potential. At higher concentrations, they prevent the occurrence of action
potentials altogether. Based on this information and your knowledge of the ionic ...
9
Skeletal Muscle: Form and Function
The functional significance of the action potential mechanism is that, once an
impulse has been initiated, excitatory changes automatically take place in
neighboring regions of the membrane and so cause the impulse to travel the
length of the ...
Brian R. MacIntosh, Phillip F. Gardiner, Alan J. McComas,
2006
10
Discovering Biological Psychology
While the cell is relatively hyperpolarized following an action potential, it can
respond, but only to larger than normal input. We refer to this period as the
relative refractory period. Because the cell is now quite negative, the sodium
channels are ...
10 NOTICIAS EN LAS QUE SE INCLUYE EL TÉRMINO «ACTION POTENTIAL»
Conoce de qué se habla en los medios de comunicación nacionales e internacionales y cómo se emplea el término
action potential en el contexto de las siguientes noticias.
Generation and isolation of oligodendrocyte progenitor cells from …
... that wraps the neuronal axons and creates defined segments of electrical insulation to maximize the speed of action potential conduction. «Nature.com, Jul 15»
RCT data questions benefits of vitamin B12 supplements for older …
... of the posterior tibial compound muscle action potential amplitude at 12 mo (mean difference: −0.2 mV; 95% CI: –0.8, 0.3 mV),” said the team. «NutraIngredients.com, Jul 15»
New in Artificial Tech: Lab-Grown Neurons That Imitate Human Cells
The electrical signal is known as an action potential (AP). The AP then propagates along the neuron's spindly axon. When the AP reaches the other end, the ... «Big Think, Jul 15»
Corporate VCs Still Out to Prove They Belong At the Deal Table
The panel included corporate venture capitalists such as Imran Eba, partner with Action Potential Venture Capital—a strategic fund of ... «Xconomy, Jun 15»
Sweden scientists build 'Artificial Neurons' that mimic function of …
Once a neuron receives the chemical signals it gets converted into an electrical action potential, which then travels along the axon of the ... «Techworm, Jun 15»
Swedish scientists create an artificial neuron that mimicks an …
... electrical pulse of membrane depolarization (action potential) along the axon, causing chemical release at the axon terminals (blue circles). «Lifeboat Foundation, Jun 15»
Listening with Lasers: Hybrid Technique Sees Into Human Body
(An action potential occurs when electrical signals travel along axons, the long fibers that carry signals away from the nerve cell body.) ... «Yahoo News, Jun 15»
Spring internship with NIH extends into summer for chemistry major …
“The action potential is the fundamental means for communication within our bodies because of the speed at which a signal travels,” explains ... «Augusta Free Press, Jun 15»
AC magnetic field mediated neuronal stimulation in brain tissue
Nociceptive neurons produce sequences of action potential in reaction to stimuli which helps to study brain circuitry. Repeated stimulus of ... «News-Medical.net, Jun 15»
Unexpected Inching Explained by an Ulnar Nerve Anatomic Variant …
An ulnar nerve electrodiagnostic study, which was performed according to current guidelines, documented a reduced sensory nerve action potential amplitude, ... «Journal of Ultrasound in Medicine, Jun 15»