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The heart sound "DUP" is Produced when :-
- a)Mitral valve opens
- b)Mitral valve closes
- c)Semilunar valve at the base of aorta closes
- d)Tricuspid valve opens
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The heart sound DUP is Produced when :-a)Mitral valve opensb)Mitral va...
The heart sound ‘’DUP’’ is produced when a semilunar valve at the base of aorta classes.
Two distinct sounds can be heard during a heart beat with the help of a stethoscope. These are 'lubb' and 'dup'.Lubb is the first sound which has a low pitch and produced by the closure of tricuspid and bicuspid valves (collectively called atrioventricular valves) at the beginning of ventricular systole.
Dup is the second sound which is sharp and has a high pitch. It is produced by closure of semilunar valves by the end of ventricular systole.
Two distinct sounds can be heard during a heart beat with the help of a stethoscope. These are 'lubb' and 'dup'.Lubb is the first sound which has a low pitch and produced by the closure of tricuspid and bicuspid valves (collectively called atrioventricular valves) at the beginning of ventricular systole.
Dup is the second sound which is sharp and has a high pitch. It is produced by closure of semilunar valves by the end of ventricular systole.
Most Upvoted Answer
The heart sound DUP is Produced when :-a)Mitral valve opensb)Mitral va...
Understanding Heart Sounds
Heart sounds are crucial indicators of cardiac function, primarily produced by the closing of heart valves. The two main sounds are "lub" (S1) and "dub" (S2).
What is the "DUB" Sound?
The "DUB" sound, clinically referred to as S2, is produced during the cardiac cycle when the semilunar valves close.
Closure of Semilunar Valves
- The semilunar valves include the aortic and pulmonary valves.
- These valves close at the end of ventricular systole (contraction), preventing blood from flowing back into the ventricles from the arteries.
- The closure generates a sharp, high-pitched sound, which we hear as the "DUB."
Significance of the "DUB" Sound
- The occurrence of the "DUB" sound indicates that the heart is transitioning from the contraction phase (systole) to the filling phase (diastole).
- It is a vital sign of effective heart function and proper valve operation.
Why Other Options Are Incorrect?
- Mitral Valve Opens (Option A): This does not produce a heart sound; it occurs during diastole when the ventricles fill with blood.
- Mitral Valve Closes (Option B): This produces the "lub" sound (S1), not the "DUB."
- Tricuspid Valve Opens (Option D): Similar to the mitral valve opening, this does not create a heart sound but allows blood flow into the right ventricle.
Conclusion
In summary, the "DUB" sound is specifically linked to the closure of the semilunar valves at the end of ventricular contraction, playing a vital role in the cardiac cycle and indicating effective heart function.
Heart sounds are crucial indicators of cardiac function, primarily produced by the closing of heart valves. The two main sounds are "lub" (S1) and "dub" (S2).
What is the "DUB" Sound?
The "DUB" sound, clinically referred to as S2, is produced during the cardiac cycle when the semilunar valves close.
Closure of Semilunar Valves
- The semilunar valves include the aortic and pulmonary valves.
- These valves close at the end of ventricular systole (contraction), preventing blood from flowing back into the ventricles from the arteries.
- The closure generates a sharp, high-pitched sound, which we hear as the "DUB."
Significance of the "DUB" Sound
- The occurrence of the "DUB" sound indicates that the heart is transitioning from the contraction phase (systole) to the filling phase (diastole).
- It is a vital sign of effective heart function and proper valve operation.
Why Other Options Are Incorrect?
- Mitral Valve Opens (Option A): This does not produce a heart sound; it occurs during diastole when the ventricles fill with blood.
- Mitral Valve Closes (Option B): This produces the "lub" sound (S1), not the "DUB."
- Tricuspid Valve Opens (Option D): Similar to the mitral valve opening, this does not create a heart sound but allows blood flow into the right ventricle.
Conclusion
In summary, the "DUB" sound is specifically linked to the closure of the semilunar valves at the end of ventricular contraction, playing a vital role in the cardiac cycle and indicating effective heart function.
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