1.

The second heart sound differs from the first heart sound in that it is A. Related to turbulence set up by valve closure. B. Longer lasting than the first sound. C. Higher in frequency. D. Occasionally split. E. Heard when the ventricles are relaxing.

Answer»

A. False This applies to both heart sounds. 

B. False It is about 20 per cent shorter. 

C. True About 50 Hz compared with 35 Hz for the first sound. 

D. False Both may be split due to asynchronous valve closure. 

E. True The first sound is due to ventricular systole; the second occurs during ventricular relaxation when the aortic valves snap shut as ventricular pressure falls below aortic.



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