The second heart sound, S2, is produced mainly by closure of which valves?
Correct answer: A. Aortic and pulmonary valves
- A. Aortic and pulmonary valves
- B. Mitral and tricuspid valves
- C. Aortic and mitral valves
- D. Pulmonary and tricuspid valves
Explanation
S2 occurs at the beginning of ventricular diastole when the aortic and pulmonary semilunar valves close. Closure of the mitral and tricuspid valves produces S1 at the beginning of ventricular systole.
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About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
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