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Videos de Conceptos Relacionados

The Resting Membrane Potential01:21

The Resting Membrane Potential

Overview
Resting Membrane Potential01:24

Resting Membrane Potential

The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
Resting Potential Decay01:15

Resting Potential Decay

The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane through...
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
Graded Potential01:19

Graded Potential

Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
Graded potentials fall into two categories: depolarizing and hyperpolarizing. Depolarizing graded potentials typically occur when sodium (Na+) or calcium...
Junction Potentials in Galvanic Cells01:21

Junction Potentials in Galvanic Cells

The Nernst equation, derived under the assumption of thermodynamic equilibrium, calculates the electromotive force (emf) as the sum of potential differences at phase boundaries in a reversible cell without a liquid junction. However, in irreversible cells such as the Daniell cell, an additional potential difference named the liquid-junction potential (EJ) arises across the interface of two electrolyte solutions due to different ion diffusion rates. This EJ represents the potential difference...

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Video Experimental Relacionado

Updated: May 11, 2026

Measuring the Induced Membrane Voltage with Di-8-ANEPPS
05:52

Measuring the Induced Membrane Voltage with Di-8-ANEPPS

Published on: November 20, 2009

Dinámica del potencial de membrana de las células de red.

Cristina Domnisoru1, Amina A Kinkhabwala, David W Tank

  • 1Princeton Neuroscience Institute, Princeton University, Princeton, New Jersey 08544, USA.

Nature
|February 12, 2013
PubMed
Resumen

Las células de la red en el cerebro crean mapas espaciales utilizando rampas despolarizadoras, no modulaciones de amplitud theta, para definir campos de disparo. Las oscilaciones theta, sin embargo, siguen siendo cruciales para regular el tiempo preciso de los picos neuronales.

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Micropatterning Transmission Electron Microscopy Grids to Direct Cell Positioning within Whole-Cell Cryo-Electron Tomography Workflows

Published on: September 13, 2021

Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • La neurociencia computacional es una neurociencia computacional.
  • La neurociencia de sistemas es la neurociencia de sistemas.

Sus antecedentes:

  • Las células de la rejilla forman una red triangular de campos de disparo cruciales para la navegación espacial.
  • Existen dos modelos principales: la interferencia oscilatoria (que predice las modulaciones de amplitud theta) y las redes de atracción (que predice rampas de despolarización lenta).

Objetivo del estudio:

  • Para diferenciar entre la interferencia oscilatoria y los modelos de red de atracción de la función de celda de red.
  • Investigar los mecanismos intracelulares subyacentes al disparo de células de red y la representación espacial.

Principales métodos:

  • Se realizaron grabaciones in vivo de células enteras en ratones que navegaban por una pista lineal de realidad virtual.
  • Los potenciales de la membrana intracelular de las células de la red se midieron directamente durante las travesías del campo de disparo.

Principales resultados:

  • Las células de la red exhibieron rampas despolarizadoras grandes y reproducibles fuertemente correlacionadas con los campos de tiro.
  • Las oscilaciones theta intracelulares influyeron en el tiempo de pico de las células de la red.
  • Las modulaciones de amplitud theta no determinaron de manera consistente las ubicaciones del campo de tiro.

Conclusiones:

  • Los hallazgos apoyan los modelos de redes de atractores, donde las rampas de despolarización lenta generan campos de cuadrícula.
  • Las oscilaciones theta controlan principalmente el tiempo de los picos en lugar de definir las ubicaciones del campo de tiro.