action potential
Let an agent explain action potentials by phases, mechanism, propagation and clinical relevance in general terms.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain action potentials by phases, mechanism, propagation and clinical relevance in general terms.
A rapid, transient reversal of the electrical potential across the membrane of an excitable cell such as a neuron or muscle cell, propagating along the cell and carrying signals; driven by voltage-gated sodium and potassium channels.
What it is for: Signalling in nerves, muscle contraction and heart rhythm.
It can be describe phases of the action potential; explain propagation and myelination; relate to ECG and nerve tests; teach neurophysiology.
Distinguishing features
All-or-none signal
Driven by ion channels
Propagates along membranes
Different shapes in heart and nerve
What it looks like
Spikes on voltage recordings.
Physical character
resting membrane potential (neuron): about -70 mV
peak: about +30 to +40 mV - neuronal
How it is recognised
Depolarisation and repolarisation phases
Neuronal and cardiac action potentials
Refractory periods
Related models
is a kind of - category
travels along - structure
triggers - effect
is related to - aggregate activity
In practice
Families and kinds
neuronal action potentials
cardiac action potentials
skeletal muscle action potentials
plant action potentials
Failure modes and hazards
Oversimplifying ion channel roles
Interpreting clinical tests without professionals
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.action-potential
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Phases Shape.
Phases explain the signal.
Sequence
Depolarisation to recovery.
Sequence
Phases.
- What happens in each phase? definition
- What are the typical voltages? measurement
Threshold
All or none.
Threshold
Threshold.
- What sets the threshold? definition
- Why is it all-or-none? definition
Mechanism Ion channels.
Channels drive it.
Channels
Sodium and potassium.
Channels
Ion channels.
- Which ion channels open and close, and when? definition
- What maintains the resting potential? definition
Refractory
Recovery.
Refractory
Refractory period.
- What is the refractory period and why does it matter? definition
- How long does it last? measurement
Propagation Travel.
Signals travel.
Speed
Conduction velocity.
Speed
Conduction velocity.
- How fast does it propagate? measurement
- How does myelin speed it up? definition
Heart
Cardiac.
Heart
Cardiac action potentials.
- How do cardiac action potentials differ? definition
- How do they relate to the ECG? definition
Clinical Relevance.
Disruptions cause disease.
Conditions
Channelopathies.
Conditions
Clinical relevance.
- Which conditions involve disrupted action potentials, in general terms? provenance
- Who should interpret tests? boundary
Teaching
Models.
Teaching
Teaching.
- Which models, such as Hodgkin-Huxley, describe it? provenance
- Which simulations help? action
What the second pass must settle
- Should cell-type action potentials be separate entries?
- How should ion channel entries be linked?
- How should clinical tests be linked?