concept

ion

Also known as: ion, ions

Facts (18)

Sources

Action potentials and synapses - Queensland Brain Institute qbi.uq.edu.au Queensland Brain Institute 3 facts

claimSynapses function by converting an electrical signal, known as an action potential, into a chemical signal through the release of neurotransmitters, which then bind to postsynaptic receptors to convert the signal back into an electrical form via the flow of charged ions.

claimMembrane potential is the electrical potential across a neuron's cell membrane, resulting from different distributions of positively and negatively charged ions inside and outside the cell.

claimNeurons function as electrical devices, utilizing channels in the cell membrane to allow positive or negative ions to flow into and out of the cell.

Bioelectricity | Cell Signaling, Nerve Impulses & Muscle Contractions britannica.com Britannica Mar 10, 2026 3 facts

claimWhen two solutions of different concentrations are separated by a membrane that allows one kind of ion to pass but not the other, the concentrations of the permeable ion tend to equalize by diffusion, producing equal and opposite net charges in the two solutions.

claimBioelectric currents consist of a flow of ions (electrically charged atoms or molecules), whereas electric currents used for lighting, communication, or power consist of a movement of electrons.

claimThe cell membrane in living cells is semipermeable, allowing certain ions to pass through while blocking others.

Human body | Organs, Systems, Structure, Diagram, & Facts britannica.com Britannica 8 days ago 2 facts

claimIons of calcium, phosphorus, sodium, potassium, and magnesium play vital roles in the metabolic processes of the human body.

claimCalcium and sodium are present as ions in human blood and interstitial fluid.

Action potential: Definition, Steps, Phases | Kenhub kenhub.com Kenhub 2 facts

procedureThe process of synaptic transmission involves the following steps: (1) the presynaptic membrane is depolarized by an action potential, (2) calcium voltage-gated channels open, (3) calcium flows into the terminal button, (4) membrane proteins in the presynaptic membrane change state, (5) neurotransmitters are released into the synaptic cleft via exocytosis, (6) neurotransmitters bind to receptors on the postsynaptic membrane, (7) ligand-gated ion channels on the postsynaptic membrane open or close, and (8) ions are redistributed in the postsynaptic cell, resulting in either excitatory or inhibitory responses.

claimThe threshold potential value depends on membrane permeability, intra- and extracellular concentration of ions, and the properties of the cell membrane.

Thinking about the action potential: the nerve signal as a window to ... frontiersin.org Frontiers 2 facts

claimLe Bihan (2007) utilized MRI technology to investigate the interaction between ions, water molecules entering the neuron during excitation, and the subaxolemmal cytoskeleton.

claimThe thermodynamics-based framework posits that the movement of an action potential relies on the same fundamental principles that cause the propagation of sound waves in a material, rather than the flow of ions or current.

Neuroanatomy, Neuron Action Potential - StatPearls - NCBI Bookshelf ncbi.nlm.nih.gov National Library of Medicine 2 facts

claimThe resting membrane potential is maintained by an unequal distribution of ions across the cellular membrane, established by ATP-dependent pumps, most notably sodium-potassium antiporters.

claimIon channels in the neuronal membrane are gated by second messengers, neurotransmitters, or voltage changes, allowing permeable ions to flow down their electrochemical gradients and alter the membrane potential.

Branching morphology determines signal propagation dynamics in ... nature.com Nature Aug 21, 2017 1 fact

referenceF. Ramon, R. W. Joyner, and J. W. Moore published 'In Membranes, Ions, and Impulses' in 1976 through Springer.

Understanding the Science behind Bioelectricity - Hilaris Publisher hilarispublisher.com Poonam Gupta · Hilaris Publisher 1 fact

claimBioelectricity arises at the cellular level from the movement of ions across cell membranes, which is driven by ion channels, pumps, and exchangers.

Bioelectricity is a universal multifaced signaling cue in living ... - PMC pmc.ncbi.nlm.nih.gov PMC Jan 28, 2025 1 fact

claimBioelectricity refers to the cellular electrical properties intrinsically caused by the uneven distributions of ions and charged molecules.

Quantum Theory of Consciousness - Scirp.org. scirp.org Gangsha Zhi, Rulin Xiu · Scientific Research Publishing 1 fact

measurementMax Tegmark estimates that decoherence time scales for ions involved in the propagation of action potentials are 10 to 20 orders of magnitude smaller than the relevant time scales of neural dynamics.