The following that would create the second heart sound is closing of the valves when blood leaves the heart. The correct option is A.
What are the valves of the heart?
Heart is an organ that pumps purified blood in the body and transfer deoxygenated blood to the lungs.
In mammals heart has four valves, heart is divided into four valves, in different species the heart has different valves. The blood go through these valves.
Thus, the correct option is A, closing of the valves when blood leaves the heart.
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