Lub And Dub Sounds |link| Link
The "lub" sound, or S1, marks the beginning of ventricular systole.
The two sounds are separate because the two pairs of valves close at within each phase: lub and dub sounds
Lub And Dub Sounds |link| Link
The "lub" sound, or S1, marks the beginning of ventricular systole.
The two sounds are separate because the two pairs of valves close at within each phase: lub and dub sounds