So next, let's talk about heart sounds.
When you listen to the heart, you hear two sounds.
We refer to these sounds as the "lub-dub" and this
is associated with the closing of those valves.
So the first sound or the "lub" is the closing of the
AV valves at the beginning of ventricular systole.
The second sound that you here or the "dub" is the closing of
the semilunar valves at the beginning of ventricular diastole.
and the pause between the two sounds
indicates the relaxation of the heart.
So the mitral valve closes slightly before the tricuspid and
the aortic valve closes slightly before the pulmonary valve.
So the differences allow for auscultation
or the listening of the heart of each valve
when a stethoscope is
placed in four different regions.
So we can place the stethoscope in specific places
on the body in order to listen to the aortic valve,
the tricuspid valve, the pulmonary
valve and the mitral valve.