NEET PG DENTAL EXAM

HISTOLOGY

BLOOD VESSELS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What causes the Lub sound?(first sound the heart makes)
A
AV valves closing
B
SL valves closing
C
Ventricles relaxing
D
AV valves opening
Explanation: 

Detailed explanation-1: -(a) First heart sound lub is produced due to closure of atrioventricular valves.

Detailed explanation-2: -Due to the closure of the atrio-ventricular valves, dup sound is produced.

Detailed explanation-3: -First heart sound: caused by atrioventricular valves – Mitral (M) and Tricuspid (T). Second heart sound caused by semilunar valves – Aortic (A) and Pulmonary/Pulmonic (P).

There is 1 question to complete.