wiz-icon
MyQuestionIcon
MyQuestionIcon
13
You visited us 13 times! Enjoying our articles? Unlock Full Access!
Question

Doctors use stethoscope to hear the sound produced during each cardiac cycle. The second sound is heard when:


A

AV node receives signal from SA node

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

AV valves open up

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

Ventricular walls vibrate due to the gushing of blood from atria.

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

Semilunar valves close down after the blood flows into vessels from ventricles.

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D

Semilunar valves close down after the blood flows into vessels from ventricles.


The “ lub” is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole.

The second sound,” dub” or S2, is caused by the closure of aortic and pulmonic valves, marking the end of systole. The pulmonary valve is the semilunar valve of the heart that lies between the right ventricle and the pulmonary artery and has three cusps.


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon