Lower rates slow the animation for teaching. The displayed rate controls the simulation only.
Colour key.
Amber ball — electrical impulse (splits at the His to depolarise both ventricles simultaneously).
Blue — SA node.
Green — AV node.
Grey — passive conduction fibres.
Red blush — depolarising muscle.
Teal — ECG trace (faded preview + bright behind the cursor).
Controls. Pause/Play, Reset, speed slider (5–80 bpm) with quick presets. The 5 bpm setting lets you read each phase label as it ticks past; 60 bpm is a realistic canine rate.
Educational illustration only.
This animation simplifies cardiac conduction. It is not a substitute for complete ECG interpretation, patient assessment or veterinary clinical judgement.