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Listen to the Lub-dub
When you go for
a checkup, your doctor uses a stethoscope to listen
carefully to your heart. A healthy heart makes a "lub-dub"
sound with each beat. This sound comes from the valves shutting on the blood
inside the heart. The first sound (the "lub") happens when the blood hits the
mitral and tricuspid valves between the atria and ventricles. The next sound
(the "dub") happens when the blood hits the aortic and pulmonic valves that
close up as the heart relaxes to fill with blood for the next beat. Next time
you go to the doctor, ask if you can listen to the "lub-dub," too.
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