Heart Valves and Heart Sounds Quiz

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Contraction of the atria during ventricular systole
Backflow of blood against the semilunar valves
Vibration of the semilunar (aortic and pulmonary) valves
Vibration of the atrioventricular (A-V) valves immediately after closure (correct)

Closure of the semilunar (aortic and pulmonary) valves at the end of systole
Contraction of the atria during ventricular systole
Backflow of blood against the semilunar valves
Closure of the atrioventricular (A-V) valves at the beginning of systole (correct)

<p>Closure of the aortic and pulmonary valves at the end of systole (A)</p> Signup and view all the answers

<p>Closure of the aortic and pulmonary valves at the end of systole (A)</p> Signup and view all the answers

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The main cause of the first heart sound is the closure of the atrioventricular (AV) valves, which include the mitral and tricuspid valves.
The first heart sound is associated with the beginning of ventricular contraction (systole), marking the start of the heart's pumping action.
The vibration of blood and the walls of the ventricles results from rapid changes in blood flow and pressure when the AV valves close, creating turbulence that generates sound.

The second heart sound is associated with the closure of the semilunar valves, specifically the aortic and pulmonary valves, occurring at the end of ventricular contraction (diastole).
The second heart sound is caused by the abrupt decrease in blood flow as the semilunar valves close, leading to vibrations from the blood and heart structures that produce the characteristic sound.