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  2. Potassium in biology - Wikipedia

    en.wikipedia.org/wiki/Potassium_in_biology

    The sodium–potassium pump a critical enzyme for regulating sodium and potassium levels in cells. Potassium is the main intracellular ion for all types of cells, while having a major role in maintenance of fluid and electrolyte balance. [1] [2] Potassium is necessary for the function of all living cells and is thus present in all plant and ...

  3. Calcium-activated potassium channel - Wikipedia

    en.wikipedia.org/wiki/Calcium-activated...

    These findings indicate that BK channels are involved in the relaxation of smooth muscle cells. In any muscle cell, increased intracellular calcium causes contraction. In smooth muscle cells the elevated levels of intracellular calcium cause the opening of BK channels which in turn allow potassium ions to flow out of the cell.

  4. Inward-rectifier potassium channel - Wikipedia

    en.wikipedia.org/wiki/Inward-rectifier_potassium...

    K ir export surplus potassium into collecting tubules for removal in the urine, or alternatively may be involved in the reuptake of potassium back into the body. neurons and in heart cells: G-protein activated IRKs (K ir 3) are important regulators, modulated by neurotransmitters. A mutation in the GIRK2 channel leads to the weaver mouse mutation.

  5. Potassium channel - Wikipedia

    en.wikipedia.org/wiki/Potassium_channel

    Potassium channels function to conduct potassium ions down their electrochemical gradient, doing so both rapidly (up to the diffusion rate of K + ions in bulk water) and selectively (excluding, most notably, sodium despite the sub-angstrom difference in ionic radius). [4] Biologically, these channels act to set or reset the resting potential in ...

  6. Potassium - Wikipedia

    en.wikipedia.org/wiki/Potassium

    Potassium homeostasis denotes the maintenance of the total body potassium content, plasma potassium level, and the ratio of the intracellular to extracellular potassium concentrations within narrow limits, in the face of pulsatile intake (meals), obligatory renal excretion, and shifts between intracellular and extracellular compartments.

  7. Calcium-activated potassium channel subunit alpha-1 - Wikipedia

    en.wikipedia.org/wiki/Calcium-activated...

    Calcium-activated potassium channel subunit alpha-1 also known as large conductance calcium-activated potassium channel, subfamily M, alpha member 1 (K Ca 1.1), or BK channel alpha subunit, [5] is a voltage gated potassium channel encoded by the KCNMA1 gene and characterized by their large conductance of potassium ions (K+) through cell membranes.

  8. ATP-sensitive potassium channel - Wikipedia

    en.wikipedia.org/wiki/ATP-sensitive_potassium...

    An ATP-sensitive potassium channel (or K ATP channel) is a type of potassium channel that is gated by intracellular nucleotides, ATP and ADP. ATP-sensitive potassium channels are composed of K ir 6.x-type subunits and sulfonylurea receptor (SUR) subunits, along with additional components. [ 1 ]

  9. KvLQT1 - Wikipedia

    en.wikipedia.org/wiki/KvLQT1

    K v 7.1 (KvLQT1) is a potassium channel protein whose primary subunit in humans is encoded by the KCNQ1 gene. [5] Its mutation causes Long QT syndrome, K v 7.1 is a voltage and lipid-gated potassium channel present in the cell membranes of cardiac tissue and in inner ear neurons among other tissues.