X' is a graphic record of the electric current generated by the excitation of cardiac muscles th...
0X' is a graphic record of the electric current generated by the excitation of cardiac muscles that gives an accurate and errorless information. ' \( \mathrm{Y} \) ' is an instrument used to record 'X'. Electrodes are placed on our chest to record our heart's electrical signals. These signals are shown as waves on an attached computer monitor or printer. ' \( \mathrm{X} \) ' is composed of \( \mathrm{P} \) wave, a QRS wave (complex) and a T-wave. A physician can easily detect the defect in our heart by examining the pattern of these waves and the time interval between them. Thus, \( X \) is of great diagnostic value in cardiac disease.
Identify \( X \) ' and ' \( Y \) ' in this passage.
(A) X-Electrocardiogram, Y-Eletrocardiograph
(B) X-Pacemaker, Y-Sphygmomanometre
(C) X-Electrocardiogram, Y-Stethoscope
(D) X-Stethoscope, Y-Electrocardiograph
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