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How many sounds are produced from the normal foetal heart action?

(a) 1

(b) 2

(c) 3

(d) 4

This question was posed to me by my school teacher while I was bunking the class.

This key question is from Recording System in section Foetal Monitoring Instruments of Biomedical Instrumentation

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Correct choice is (b) 2

Explanation: From the normal foetal heart action, generally two sounds are produced corresponding to the contraction and relaxation of the heart muscles. These two bursts of heart sounds are mixed up with unwanted signals which may succeed in passing through the filters.

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