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At the conclusion of the first heart sound, which statement accurately describes the state of the mitral and tricuspid valves (left and right atrioventricular valves, respectively)?
Mitral valve is closed, tricuspid valve is open.
Mitral valve is open, tricuspid valve is closed.
Both mitral and tricuspid valves are open.
Both mitral and tricuspid valves are closed.
Answers (1)
At the end of the first heart sound (S1), both the mitral valve (left atrioventricular valve) and the tricuspid valve (right atrioventricular valve) are closed. The closure of these valves is responsible for producing the "lub" sound heard during auscultation.
The closure of the atrioventricular valves occurs during ventricular systole, which is the phase when the ventricles contract and pump blood out of the heart. The closure of these valves prevents the backflow of blood from the ventricles to the atria, ensuring that blood is ejected forward into the pulmonary artery and aorta.
Therefore, the correct statement is that both the mitral and tricuspid valves are closed at the end of the first heart sound (S1), indicating the onset of ventricular contraction and the initiation of the ejection phase of the cardiac cycle.
Hence, the correct answer is option 4.
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