Question

how lub and dub sounds produce in the heart​

Answer 1

Answer:

lubb sounds -closing of auricles opening of ventricles and dubb sounds is the opposite case. i.e.opening of auricles and closing of ventricles in heart

Answer 2

The heart tone “lub,” or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole. The heart tone “dub,” or S2 ( a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole