19.What heart action causes the lub-dub sounds heard over the heart with a stethoscope?
(1 Point)
The flow of blood through the coronary vessels
The contraction and relaxation of heart muscles
The closing of the valves
The sound of the blood gushing through the aorta and the vena cava
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Explanation:
The familiar 'lub-dub' sound of the heartbeat is caused by the rhythmic closing of the heart valves as blood is pumped in and out of the chambers. A heart murmur is a whooshing, humming or rasping sound between the heartbeat sounds.
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