The second heart sound (dub) is associated with the closure of the_________
The second heart sound (dubb) is associated with the closure of ? (a) tricuspid valve (b) semilunar valve (c) bicuspid valve (d) tricuspid and bicuspid valve
The first sound of the heart beat occurs during 1______, associated with the closure of 2_______, and 3______, The second sound of the heart beat occurs during 4_____, associated with the closure of 5______, and 6______.