Prab: CSV import

2025-02-18T11:41:24Z

CSV import

← Older revision		Revision as of 11:41, 18 February 2025
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			<gallery>
			File:Basis_of_Membrane_Potential2-en.svg\|Basis of Membrane Potential
			File:Electric_dipole.PNG\|Electric Dipole
			File:Diffusion.en.svg\|Diffusion
			File:Cell_membrane_detailed_diagram_en.svg\|Cell Membrane Detailed Diagram
			File:Scheme_facilitated_diffusion_in_cell_membrane-en.svg\|Scheme of Facilitated Diffusion in Cell Membrane
			File:Scheme_sodium-potassium_pump-en.svg\|Scheme of Sodium-Potassium Pump
			File:Action_potential_ion_sizes.svg\|Action Potential Ion Sizes
			File:Potassium_channel1.png\|Potassium Channel
			File:LGIC.png\|Ligand-Gated Ion Channel
			File:Cell_membrane_equivalent_circuit.svg\|Cell Membrane Equivalent Circuit
			File:Cell_membrane_reduced_circuit.svg\|Cell Membrane Reduced Circuit
			File:IPSPsummation.JPG\|IPSP Summation
			</gallery>

Prab: CSV import

2024-02-23T12:45:56Z

CSV import

New page

'''Membrane potential''' is the difference in [[electric potential]] between the interior and the exterior of a [[biological cell]]. With respect to the exterior of the cell, typical values of membrane potential, normally given in millivolts, range from –40 mV to –80 mV.

All animal cells are surrounded by a [[membrane]] composed of a [[lipid bilayer]] with proteins embedded in it. The membrane serves to separate and protect a cell from its surrounding environment and is made mostly from a double layer of phospholipids, hence the name lipid bilayer. The phospholipids that make up the lion's share of the lipid bilayer are amphipathic or dual-loving, with a hydrophilic or water-loving head and a hydrophobic or water-fearing tail.

The membrane potential has two basic functions. First, it allows a cell to function as a [[battery]], providing power to operate a variety of "molecular devices" embedded in the membrane. Second, in electrically excitable cells such as [[neuron]]s and [[muscle cells]], it is used for transmitting signals between different parts of a cell. Signals are generated by opening or closing of [[ion channels]] at one point in the membrane, producing a local change in the membrane potential. This change in the membrane potential will raise or lower the probability that a nearby channel will open, thus enabling transmission of the signal.

[[Category:Cell biology]]
[[Category:Electrochemistry]]
[[Category:Membrane biology]]
[[Category:Neuroscience]]
[[Category:Electrophysiology]]

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← Older revision		Revision as of 11:41, 18 February 2025
Line 13:		Line 13:
	{{stub}}		{{stub}}
	{{dictionary-stub1}}		{{dictionary-stub1}}
			<gallery>
			File:Basis_of_Membrane_Potential2-en.svg\|Basis of Membrane Potential
			File:Electric_dipole.PNG\|Electric Dipole
			File:Diffusion.en.svg\|Diffusion
			File:Cell_membrane_detailed_diagram_en.svg\|Cell Membrane Detailed Diagram
			File:Scheme_facilitated_diffusion_in_cell_membrane-en.svg\|Scheme of Facilitated Diffusion in Cell Membrane
			File:Scheme_sodium-potassium_pump-en.svg\|Scheme of Sodium-Potassium Pump
			File:Action_potential_ion_sizes.svg\|Action Potential Ion Sizes
			File:Potassium_channel1.png\|Potassium Channel
			File:LGIC.png\|Ligand-Gated Ion Channel
			File:Cell_membrane_equivalent_circuit.svg\|Cell Membrane Equivalent Circuit
			File:Cell_membrane_reduced_circuit.svg\|Cell Membrane Reduced Circuit
			File:IPSPsummation.JPG\|IPSP Summation
			</gallery>

Membrane potential - Revision history

Prab: CSV import

Prab: CSV import