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abbreviation action potential alpha rhythm amplitude applied atria bioelectric bioelectric signals body brain capacitors cardiac cycle cardiotachometer cathode-ray tube cell Cephalography changes chest circuit clinical coil contraction counter coupling crystal defibrillator Depolarization detecting diagnostic diathermy differential amplifier direct-coupled amplifier displayed elec electrical activity electrocardiogram electrodes electroencephalogram Electroencephalography Electromyography employed Fibrillation finger heart muscle heart rate heart sounds heartbeat heat impedance input leads input signal instrument known Light-Beam Galvanometer mechanical Medical Amplifier medical applications medical oscilloscope ment microphone microvolts monitoring muscle fibers needle electrode nerve normal oscillator oscilloscope output oxygen pacemaker pads pair of electrodes paper chart patient phonocardiography piezoelectric Plethysmograph potential pressure process of recording produce radioactivity range rays RC-coupled recorded waveform recording and interpreting resistor rhythm screen shown in Fig stethoscope strip-chart recorder surface electrodes tissues transducer transistors trodes typically ultrasonic ultrasonic energy Ultrasound variations ventricles vibrations voltage waveform waves waveshape