(D) The heart sounds are $Lubb$ and $Dub$.$Lubb$ is the first heart sound,which is low-pitched and of longer duration,caused by the closure of the atr

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Both Assertion and Reason are incorrect.

(D) The heart sounds are $Lubb$ and $Dub$.$Lubb$ is the first heart sound,which is low-pitched and of longer duration,caused by the closure of the atrioventricular $(AV)$ valves.$Dub$ is the second heart sound,which is high-pitched and of shorter duration,caused by the closure of the semilunar valves.Therefore,the Assertion is incorrect because 'Dub' is short and sharp,and the Reason is incorrect because 'Dub' is caused by semilunar valves,not $AV$ valves.

Class 11 Biology Body Fluids and Circulations Mix Examples- Body Fluids and Circulations

Medium

$A$: 'Dub' is a long and sharp sound.
$R$: It is caused by the closing of atrioventricular valves.

A
Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
B
Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.
C
Assertion is correct,but Reason is incorrect.
D
Both Assertion and Reason are incorrect.

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Body Fluids and Circulations

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Mix Examples- Body Fluids and Circulations

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$A$: 'Dub' is a long and sharp sound.$R$: It is caused by the closing of atrioventricular valves.

Similar Questions

Statement-$I$: The first heart sound $(lub)$ is associated with the opening of the tricuspid and bicuspid valves.Statement-$II$: Cardiac output of an athlete is much higher than that of an ordinary man.

Which of the following is $NOT$ a character of open circulation?

Which of the following vertebrate organs receives only oxygenated blood?

Cardiac output is determined by.

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$A$: 'Dub' is a long and sharp sound.
$R$: It is caused by the closing of atrioventricular valves.

Statement-$I$: The first heart sound $(lub)$ is associated with the opening of the tricuspid and bicuspid valves.
Statement-$II$: Cardiac output of an athlete is much higher than that of an ordinary man.