Answer
ECG/EKG waveform.
The GIF illustrates a heartbeat or ECG/EKG waveform.
Answer for screen readers
The GIF illustrates a heartbeat or ECG/EKG waveform.
More Information
An electrocardiogram (ECG or EKG) records the electrical activity of the heart over time, typically shown in a waveform with peaks corresponding to different phases of the cardiac cycle.
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