MHT CET · BIOLOGY · STD 12 - 8. Respiration and Circulation

Select the INCORRECT statement with respect to heart sounds.

A Dub sound is heard due to closure of semilunar valves.
B Lub sound is heard due to closure of Thebesian valve.
C Sounds heard during measurement of blood pressure and called Korotkoff sound.
D During measurement of B.P. by sphygmomanometer, when the first pulsatile sound is heard the pressure indicated is systolic pressure.

Verified Solution

Answer & Solution

Correct Answer

(B) Lub sound is heard due to closure of Thebesian valve.

Step-by-step Solution

Detailed explanation

Lub is the sound produced by closure of AV valve.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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