The sound of a heartbeat as heard through a stethoscope is produced by _________. A. electrical signals

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The sound of a heartbeat as heard through a stethoscope is produced by _________.

A. electrical signals from the SA node;

B. Rush of blood into the ventricles and out of the atria;

C. The ribs expanding as the diaphragm contracts;

D. the closing of valves between heart chambers and vessels;

E. The pulse of blood flowing through the arteries

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Biology Science For Life With Physiology

ISBN: 9780134555430

6th Edition

Authors: Colleen Belk, Virginia Maier

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