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Who provides a recording of waveforms of heart sounds?

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Who provides a recording of waveforms of heart sounds?

(a) Electrocardiograph

(b) Vectorcardiograph

(c) Phonocardiograph

(d) Electromyograph

This question was posed to me in my homework.

The doubt is from Measurement of Temperature in section Patient Monitoring System of Biomedical Instrumentation

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Correct answer is (c) Phonocardiograph

To elaborate: The phonocardiographs provide a recording of the waveforms of the heart sounds. These waveforms are diagnostically more important and revealing than the sounds themselves.

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