A patient care technician should identify that which of the following parts of the EKG machine regulates the height of the waveforms on the tracing? Gain control Electrodes Lead selector Artifact filter

The correct answer is Gain control.<br /><br />The gain control on an EKG machine regulates the height of the waveforms on the tracing. It adjusts the amplitude of the electrical signals recorded by the EKG machine, which in turn affects the height of the waveforms displayed on the tracing. By adjusting the gain control, the technician can ensure that the waveforms are of appropriate height and that the tracing is clear and readable.