The Lub Dub

Almost everyone has heard the real or recorded sound of a heartbeat. When your heart beats, it makes a "lub-DUB" sound. Between the time you hear "lub" and "DUB," blood is pumped through your heart and circulatory system.A heartbeat may seem like a simple, repeated event, but it's a complex series of very precise and coordinated events that take place inside and around your heart.