📝 Multiple Choice Question
General-science
In the human circulatory system the 'Heart Sounds' (Lubb-Dupp) are produced by the
A
Contraction of the ventricles
B
Closing of the valves
C
Flow of blood in the aorta
D
Relaxation of the atria
Explanation
'Lubb' is from AV valves closing; 'Dupp' is from semilunar valves closing.
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