The Beating Heart
Interactions
- Click the sinoatrial node for an early extra beat, followed by a compensatory pause
- Click the AV node to block every second impulse for nine seconds: the atria beat twice for each ventricular beat
- Drag up or down anywhere to raise or lower the heart rate; it drifts back by itself
- Idle: the rate drifts slowly between rest and exercise, and breathing sways it a little