The heart sounds "lub" and "dup" result from ________. the heart sounds "lub" and "dup" result from ________. firing of the nodes of the intrinsic conduction system closure of heart valves blood rushing through the chambers contraction of the heart opening of the heart valves
These are the first heart sound (S1) and second heart sound (S2), produced by the closing of the atrioventricular valves and semilunar valves, respectively.
