Question

The Lub Sound Of Heart Is Due To______

Answer 1

Answer:

It is due to the relationship and contraction of walls of heart which help in pumping blood

Explanation:

Answer 2

Answer:

The lubb sound of heart is due to contraction.

Explanation:

The first heart tone "lub," or S1, is caused by the closure of the mitral and tricuspid atrioventricular valves at the beginning of ventricular systole.