The first heart sound ("lubb")
A) is associated with atrial systole.
B) is associated with closing of the mitral valve.
C) is associated with opening of the mitral valve.
D) is associated with closing of the aortic valve.
E) is associated with opening of the aortic valve.

Question

Quizplus · Accepted Answer

The first heart sound, also known as "lubb," is associated with the closing of the mitral valve and tricuspid valve as the ventricles contract during ventricular systole.

The First Heart Sound ("Lubb")