PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
At the instant following the second heart sound, which heart valves are open?
|
|
Both atrioventricular valves and semilunar valves
|
|
|
Atrioventricular valves only
|
|
|
All valves are closed
|
|
|
Semilunar valves only
|
Explanation:
Detailed explanation-1: -All valves are closed during the second heart sound.
Detailed explanation-2: -S2. The second heart sound, called S2, makes a “dub” sound caused by the closure of the semilunar (aortic and pulmonary) valves following ventricular systole.
Detailed explanation-3: -During each cardiac cycle two prominent sounds are produced which can be easily heard through a stethoscope. The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves.
There is 1 question to complete.