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Related Concept Videos

Antihypertensive Drugs: Potassium-Sparing Diuretics01:28

Antihypertensive Drugs: Potassium-Sparing Diuretics

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Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
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Roles of Electrolytes: Sodium and Potassium01:24

Roles of Electrolytes: Sodium and Potassium

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Sodium plays a crucial role in maintaining fluid and electrolyte balance and overall bodily homeostasis. Sodium balance is primarily regulated by kidney function, which adjusts sodium elimination to match dietary intake and maintain proper electrolyte levels. Sodium is the most abundant cation in the extracellular fluid (ECF) and is found in salts such as sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). Although cellular plasma membranes are relatively impermeable to sodium, its role in...
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Antiepileptic Drugs: Potassium Channel Activators01:20

Antiepileptic Drugs: Potassium Channel Activators

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Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...
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Resting Membrane Potential01:24

Resting Membrane Potential

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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...
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The Resting Membrane Potential01:21

The Resting Membrane Potential

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Overview
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Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

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The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily...
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Related Experiment Video

Updated: Mar 21, 2026

Making, Testing, and Using Potassium Ion Selective Microelectrodes in Tissue Slices of Adult Brain
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Making, Testing, and Using Potassium Ion Selective Microelectrodes in Tissue Slices of Adult Brain

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Potassium: friend or foe?

Aylin R Rodan1

  • 1Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, 75390-8856, USA. Aylin.rodan@utsouthwestern.edu.

Pediatric Nephrology (Berlin, Germany)
|May 20, 2016
PubMed
Summary

Maintaining proper serum potassium levels is vital for preventing muscle dysfunction, respiratory failure, and cardiac arrest. This review covers potassium

Area of Science:

  • Nephrology
  • Cardiovascular Physiology
  • Electrolyte Balance

Background:

  • The kidney is crucial for maintaining blood ion concentration homeostasis.
  • Potassium's cell membrane gradient critically influences membrane potential, impacting cellular function.
  • Deviations in serum potassium, such as hypokalemia and hyperkalemia, are linked to significant morbidity and mortality.

Purpose of the Study:

  • To review the beneficial effects of dietary potassium on blood pressure and cardiovascular/renal outcomes.
  • To explore the physiological underpinnings of potassium's effects on cardiovascular and renal health.
  • To examine risk factors for hyperkalemia and evaluate current and novel therapeutic strategies.

Main Methods:

  • Literature review of existing data on potassium's role in homeostasis.
Keywords:
HyperkalemiaHypokalemiaPatiromerPotassium homeostasisPotassium intakeSodium polystyrene sulfonateZS-9

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Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique
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  • Analysis of physiological mechanisms linking potassium, sodium handling, and kidney function.
  • Synthesis of information on risk factors, benefits, and drawbacks of hyperkalemia therapies.

    • Main Results:

    • Adequate potassium intake is associated with improved blood pressure and cardiovascular/renal outcomes.
    • Potassium excess can be detrimental, with specific risk factors contributing to hyperkalemia.
    • Existing and emerging therapies for hyperkalemia present both risks and benefits.

    Conclusions:

    • Potassium homeostasis is essential for preventing severe health consequences.
    • Dietary potassium offers benefits for cardiovascular and renal health, mediated by kidney function.
    • Careful management of potassium levels, including therapeutic interventions for hyperkalemia, is critical.