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voltage-gated sodium channels
Also known as: voltage-gated sodium channel
Facts (10)
Sources
Neuroanatomy, Neuron Action Potential - StatPearls - NCBI Bookshelf ncbi.nlm.nih.gov 6 facts
claimParalytic shellfish toxins (PSTs) are found in marine and freshwater environments among dinoflagellates and function by binding to and blocking voltage-gated sodium channels, while also targeting potassium and calcium channels to some degree.
claimA neuronal action potential is generated when the negative inside potential of the neuron reaches a less negative threshold, which opens voltage-gated sodium channels and results in depolarization.
claimWider axons possess lower internal resistance, and a higher density of voltage-gated sodium channels in the neuronal membrane decreases membrane resistance, both of which affect action potential propagation speed.
claimThe rapid depolarization or upstroke of the neuronal action potential is caused by the opening of voltage-gated sodium channels.
claimChannelopathies are diseases resulting from problems with voltage-gated sodium channels, affecting excitable tissues such as neurons, skeletal muscles, and cardiac muscles.
claimVoltage-gated sodium channels are large transmembrane proteins with subunits encoded by ten mammalian genes.
Action potential: Definition, Steps, Phases | Kenhub kenhub.com 3 facts
claimA new action potential cannot be generated during the depolarization phase of a neuron because all voltage-gated sodium channels are already opened or are opening at their maximum speed.
claimThe threshold potential is defined as the value of the membrane potential at which voltage-gated sodium channels open.
claimDuring the depolarization phase, the threshold potential opens voltage-gated sodium channels, causing a large influx of sodium ions and making the inside of the cell more electropositive.
A Hilbertian approach to biological problems | PLOS Complex ... journals.plos.org Nov 5, 2024 1 fact
referenceM. Duménieu, M. Oulé, M.R. Kreutz, and J. Lopez-Rojas published 'The Segregated Expression of Voltage-Gated Potassium and Sodium Channels in Neuronal Membranes: Functional Implications and Regulatory Mechanisms' in Frontiers in Cellular Neuroscience in 2017.