Question

Describe the sequence of events which occur in the cardiac cycle in humans. Where and how are the sounds lubb and dubb produced in the heart during this cycle ?

Answer 1

Answer:

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Answer 2

Answer:

These sounds are caused by the closure of valves in the cardiac cycle: S1(the “lub”): occurs at the end of the filling phase when the atrioventricular valves snap shut. S2(the “dub”): occurs at the end of the outflow phase when the outflow valves snap shut.