The heartbeat is a cycle with two distinct phases. Each phase creates a specific sound.
The "lub-dub" is the sound of a perfectly timed security system. The "lub" closes the entrance to the pumping chambers, and the "dub" closes the exit. Together, they ensure that your blood only moves in one direction: forward. what is the lub dub sound
The "lub" marks the beginning of systole, while the "dub" marks the beginning of diastole. The heartbeat is a cycle with two distinct phases