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Related Concept Videos

The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
Ion Channels01:19

Ion Channels

The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow specific...

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Related Experiment Video

Updated: May 14, 2026

Recapitulation of an Ion Channel IV Curve Using Frequency Components
10:14

Recapitulation of an Ion Channel IV Curve Using Frequency Components

Published on: February 8, 2011

Physics of ion channels.

Serdar Kuyucak1, Turgut Bastug

  • 1Department of Theoretical Physics, Research School of Physical Sciences, Australian National University, Canberra, ACT 0200 Australia.

Journal of Biological Physics
|January 25, 2013
PubMed
Summary
This summary is machine-generated.

This review covers ion transport across cell membranes, focusing on electrochemical forces. Brownian dynamics is presented as a key model bridging experiments and theory for understanding ion channel function.

Keywords:
Brownian dynamicscontinuum theoriesion channelsmolecular dynamicspermeation models

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Determination of the Relative Cell Surface and Total Expression of Recombinant Ion Channels Using Flow Cytometry
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Determination of the Relative Cell Surface and Total Expression of Recombinant Ion Channels Using Flow Cytometry

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Capturing the Interaction Kinetics of an Ion Channel Protein with Small Molecules by the Bio-layer Interferometry Assay
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Capturing the Interaction Kinetics of an Ion Channel Protein with Small Molecules by the Bio-layer Interferometry Assay

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Related Experiment Videos

Last Updated: May 14, 2026

Recapitulation of an Ion Channel IV Curve Using Frequency Components
10:14

Recapitulation of an Ion Channel IV Curve Using Frequency Components

Published on: February 8, 2011

Determination of the Relative Cell Surface and Total Expression of Recombinant Ion Channels Using Flow Cytometry
11:32

Determination of the Relative Cell Surface and Total Expression of Recombinant Ion Channels Using Flow Cytometry

Published on: September 28, 2016

Capturing the Interaction Kinetics of an Ion Channel Protein with Small Molecules by the Bio-layer Interferometry Assay
10:41

Capturing the Interaction Kinetics of an Ion Channel Protein with Small Molecules by the Bio-layer Interferometry Assay

Published on: March 7, 2018

Area of Science:

  • Biophysics
  • Computational Biology

Background:

  • Cellular ion transport is crucial for physiological processes.
  • Understanding ion diffusion across membrane channels requires integrating physics and biology.

Purpose of the Study:

  • To review the fundamental physics of ion transport in cellular membrane channels.
  • To highlight the utility of Brownian dynamics in modeling ion diffusion.
  • To connect theoretical approaches with experimental data.

Main Methods:

  • Discussion of electrochemical forces governing ion diffusion.
  • Microscopic and macroscopic perspectives on ion transport.
  • Application of Brownian dynamics and molecular dynamics simulations.

Main Results:

  • Electrochemical forces are key drivers of ion diffusion.
  • Brownian dynamics offers a minimal yet effective model for ion channel transport.
  • Molecular dynamics can be applied to channels with known structures.

Conclusions:

  • Brownian dynamics serves as a vital link between experimental observations and theoretical frameworks.
  • Computational methods like Brownian and molecular dynamics are essential for studying ion channel mechanisms.