What is the Cardiac Rhythm multi-solver?

Cardiac Rhythm is a guided workflow that chains 1 individual PolySim solvers into one end-to-end analysis, piping each result into the next step.

Yes. Every step runs entirely in your browser using real numerics — no install, no account, no cloud cost. Custom or private solver packs are available as a paid service.

Biology & Aerospace Pack · Multi-Solver

Cardiac Rhythm

Conduction & arrhythmia. This multi-solver chains 1 solvers into a single guided workflow — run each step in order and carry the result forward.

Workflow steps

neuron

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Neuron

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Hodgkin-Huxley NeuronLive

the action potential

Controls

Speed1×

Presets

Injected current (µA/cm²)

The Hodgkin-Huxley model — the Nobel-winning description of the nerve impulse — tracks voltage and the opening of sodium and potassium channels. Below a threshold current the neuron is silent; above it, it fires a train of action potentials whose rate climbs with the stimulus.

▶ Run in Python

Data Inspector

Firing rate0.0 Hz

Regimespiking

ChannelsNa⁺ / K⁺

Governing equation

C_{m} \frac{d V}{d t} = 10 - \overset{g}{ˉ}_{N a} m^{3} h (V - E_{N a}) - \overset{g}{ˉ}_{K} n^{4} (V - E_{K}) - \overset{g}{ˉ}_{L} (V - E_{L})

Reading this result: Above threshold: each stimulus recharges the membrane fast enough to re-trigger Na⁺ channels, so the neuron fires a repetitive train whose rate rises with the current.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Frequently asked questions

What is the Cardiac Rhythm multi-solver?: Cardiac Rhythm is a guided workflow that chains 1 individual PolySim solvers into one end-to-end analysis, piping each result into the next step.
Is it free to use?: Yes. Every step runs entirely in your browser using real numerics — no install, no account, no cloud cost. Custom or private solver packs are available as a paid service.