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What events in the cardiac cycle cause the first and second heart sounds?
Wiki User
∙ 12y ago
The closing of the mitral and tricuspid valves create the "lubb" and the closing of the semilunar valves creates the "dubb"
Wiki User
∙ 12y ago
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ur ugly face
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Is nicotine a vasoconstrictor?
Yes; stimulants cause vasoconstriction. Vasoconstriction is the narrowing of the blood vessels. Narrow blood vessels increase the risk of plaque build up and life-threatening cardiac events such as a blood clot.
