Ye the actual frequency of the pulse produced by the heart will be in the range of hearing, but the actual heart rate (120 to 160 beats per minute equal 2 to almost 3 time per second) i not the frequency of the sound. If you want to capture information about thi, you could feed into an oscilloscope and adjust the setting so that you can measure the number of pulse in a time scale. Or you could record the sound then time how many beats in 15 seconds, for example, then multiply by 4 to get beats per minute.
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