Answer
414.9k+ views
Hint: Heart sounds are the noises created by the beating heart and the subsequent flow of blood through it. Specifically, the sounds reflect the turbulence induced when the heart valves snap shut.
Complete answer:
> Option A is correct. The first heart sound we hear is caused by the simultaneous closing of the bicuspid (mitral) valve and the tricuspid valve, both atrioventricular valves. It is similar to the word "LUBB" and is created due to the isometric period of contraction and the earlier part of the period of ejection.
> Option B is incorrect. The tricuspid and mitral valves open when the two atrium chambers contract, both of which allow blood to flow to the ventricles. When the two ventricle chambers contract, when the pulmonary and aortic valves open, they cause the tricuspid and mitral valves to close.
> Option C is incorrect. In order to direct blood flow through the heart, the semilunar valves work in conjunction with the AV valves. The semilunar valves are closed while the atrioventricular valves are open, and blood is pushed into the ventricles. The semilunar valves open when the AV valves close, pushing blood into the aorta and pulmonary artery.
> Option D is incorrect. In the superior portion of the inferior vena cava (IVC), the Eustachian valve (EV) is located and protrudes into the right atrial cavity. It is regarded as a functional valve in the foetus that helps guide oxygenated blood to the foramen ovale from the IVC, thus bypassing the pulmonary circulation.
Hence, the correct answer is option (A).
Note: Reverberation within the blood associated with the sudden block of flow reversal by the closure of the valves results in heart sounds. Because of this, auscultation is typically performed not at the location of the valve but at the location to which the sound waves reverberate to determine the function of a valve.
Complete answer:
> Option A is correct. The first heart sound we hear is caused by the simultaneous closing of the bicuspid (mitral) valve and the tricuspid valve, both atrioventricular valves. It is similar to the word "LUBB" and is created due to the isometric period of contraction and the earlier part of the period of ejection.
> Option B is incorrect. The tricuspid and mitral valves open when the two atrium chambers contract, both of which allow blood to flow to the ventricles. When the two ventricle chambers contract, when the pulmonary and aortic valves open, they cause the tricuspid and mitral valves to close.
> Option C is incorrect. In order to direct blood flow through the heart, the semilunar valves work in conjunction with the AV valves. The semilunar valves are closed while the atrioventricular valves are open, and blood is pushed into the ventricles. The semilunar valves open when the AV valves close, pushing blood into the aorta and pulmonary artery.
> Option D is incorrect. In the superior portion of the inferior vena cava (IVC), the Eustachian valve (EV) is located and protrudes into the right atrial cavity. It is regarded as a functional valve in the foetus that helps guide oxygenated blood to the foramen ovale from the IVC, thus bypassing the pulmonary circulation.
Hence, the correct answer is option (A).
Note: Reverberation within the blood associated with the sudden block of flow reversal by the closure of the valves results in heart sounds. Because of this, auscultation is typically performed not at the location of the valve but at the location to which the sound waves reverberate to determine the function of a valve.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Why Are Noble Gases NonReactive class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let X and Y be the sets of all positive divisors of class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x and y be 2 real numbers which satisfy the equations class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x 4log 2sqrt 9k 1 + 7 and y dfrac132log 2sqrt5 class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x22ax+b20 and x22bx+a20 be two equations Then the class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
At which age domestication of animals started A Neolithic class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write a letter to the principal requesting him to grant class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill in the blanks A 1 lakh ten thousand B 1 million class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)