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the claim

Extracellular potassium and calcium ion concentrations alter cellular excitability

the verdict
SUPPORTED
the evidence backs this
Recorded sources
5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that extracellular potassium and calcium ion concentrations alter cellular excitability?

Yes. Extracellular potassium and calcium ion concentrations play a fundamental role in maintaining and altering cellular excitability across muscle, neural, and cardiac tissues.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked

The analysis

The provided literature extensively establishes that changes in extracellular potassium and calcium ion concentrations or gradients directly affect membrane potential, channel function, and cellular excitability in various tissue types. Multiple papers support this mechanism without conflicting evidence.

Evidence for · 5
Investigation of the relationship between cell-surface calcium-ion gating and phosphatidylinositol turnover by comparison of the effects of elevated extracellular potassium ion concentration on ileium smooth muscle and pancreas
1976
Demonstrates that elevated extracellular potassium ion concentration increases cell-surface calcium permeability and subsequent contraction in smooth muscle.
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Jafferji, S. S. & Michell, R. H. (1976). Investigation of the relationship between cell-surface calcium-ion gating and phosphatidylinositol turnover by comparison of the effects of elevated extracellular potassium ion concentration on ileium smooth muscle and pancreas. doi.org. https://doi.org/10.1042/bj1600397

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More for · 4
Ion gradient-driven bifurcations of a multi-scale neuronal model
2022
Shows that variations in sodium, calcium, and potassium reversal potentials and gradients cause decreases in neural activity and altered excitability.
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Chesebro, A. G., Mujica-Parodi, L., & Weistuch, C. (2022). Ion gradient-driven bifurcations of a multi-scale neuronal model. doi.org. https://doi.org/10.1101/2022.10.01.510461

Astrocytic TCF7L2 Impacts Brain Osmoregulation and Restricts Neuronal Excitability
2025
Indicates that impaired extracellular potassium clearance by astrocytes leads to altered resting membrane potential and reduced neuronal excitability.
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Popek, M., Goryca, K., Adamska, D., Urban-Ciećko, J., Hryniewiecka, K., Lipiec, M., Krawczyk, T. G., Rafalko, K., Ławicka, A., Liddelow, S., & Szewczyk, L. M. (2025). Astrocytic TCF7L2 Impacts Brain Osmoregulation and Restricts Neuronal Excitability. doi.org. https://doi.org/10.1002/glia.70103

Nonlinear dynamics of seizure suppression via optogenetic modulation of neuron-astrocyte interaction.
2026
Integrates dynamic sodium, potassium, and calcium concentrations to show how extracellular ion regulation directly modulates neuronal excitability and seizure activity.
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M, M., A, A., & F, B. (2026). Nonlinear dynamics of seizure suppression via optogenetic modulation of neuron-astrocyte interaction.. doi.org. https://doi.org/10.1038/s41598-026-42663-0

The exquisite link between potassium homeostasis regulation and cardiovascular health: exploration and analysis.
2026
Highlights that tightly regulated extracellular and intracellular potassium ions are essential for cardiac electrophysiological stability and excitability.
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C, W., X, H., Z, Z., D, L., & S, H. (2026). The exquisite link between potassium homeostasis regulation and cardiovascular health: exploration and analysis.. doi.org. https://doi.org/10.3389/fphys.2026.1772535

What does the evidence say?

The provided literature extensively establishes that changes in extracellular potassium and calcium ion concentrations or gradients directly affect membrane potential, channel function, and cellular excitability in various tissue types. Multiple papers support this mechanism without conflicting evidence.

Receipt History
first checked05 Aug 2026
judged → SUPPORTED · 8405 Aug 2026
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