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Year 2
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Physiology
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Quiz
Multiple choice · Foundation
The cardiac cycle
Question 1 of 5
0 correct
The first heart sound (S1) is caused by closure of the…
A
Aortic and pulmonary valves
B
Mitral and tricuspid valves
C
Aortic and mitral valves
D
Pulmonary and tricuspid valves
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