An instrument called an electrocardiograph picks up the electrical changes in the heart muscle and amplifies them to record an electrocardiogram in the form of five waves.The five waves are labeled P, Q, R, S, and T.Which of the following statements best describes this process?

Question

Quizplus · Accepted Answer

An electrocardiograph detects and records the electrical changes in the heart muscle which are detectable and predictable. The five waves labeled P, Q, R, S, and T are indicative of specific electrical events in the heart. The myocardium (heart muscle) is indeed involved in producing these electrical changes. Diseased hearts may have abnormal electrical signals, but healthy hearts also give off electrical signals that can be measured by an electrocardiograph. The electrocardiograph does not measure the strength of the myocardial contraction, but rather the electrical activity of the heart.

An Instrument Called an Electrocardiograph Picks Up the Electrical Changes