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Related Concept Videos

Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

8.2K
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...
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Excitatory and Inhibitory Effects of Neurotransmitters01:29

Excitatory and Inhibitory Effects of Neurotransmitters

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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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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....
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Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
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Ion Channels01:19

Ion Channels

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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...
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Related Experiment Video

Updated: Jun 22, 2025

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

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Ion Channels and Neurological Disease.

Carlo Musio1

  • 1Institute of Biophysics-IBF, National Research Council-CNR, Via Sommarive 18, 38123 Trento, Italy.

Life (Basel, Switzerland)
|June 27, 2024
PubMed
Summary

Ion channels control membrane physiology and neurotransmission by regulating ion flow, which is essential for neuronal signaling and synaptic transmission.

Area of Science:

  • Neuroscience
  • Cell Physiology

Background:

  • Ion channels are critical for regulating membrane potential and cellular excitability.
  • They facilitate the movement of ions across cell membranes, underpinning essential physiological processes.
  • These channels play a pivotal role in neurotransmission and neuronal signal propagation.

Discussion:

  • The precise control of ionic fluxes by ion channels is fundamental to neuronal function.
  • Dysregulation of ion channel activity is implicated in various neurological disorders.
  • Understanding ion channel mechanisms provides insights into synaptic transmission and overall nervous system health.

Key Insights:

  • Ionic fluxes mediated by ion channels are indispensable for neuronal signal propagation.
  • Synaptic transmission relies heavily on the proper functioning of these membrane proteins.

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  • Ion channels are central to maintaining membrane physiology and enabling intercellular communication.

    • Outlook:

    • Further research into ion channel structure and function will illuminate novel therapeutic targets.
    • Investigating ion channelopathies can lead to better diagnostic and treatment strategies for neurological diseases.
    • Exploring the role of ion channels in complex neural circuits promises advancements in understanding brain function.