What makes the S2 sound?
a. The closing of the tricuspid and bicuspid valves
b. The opening of the tricuspid and bicuspid valves
c. The opening of the semilunar valves
d. The closing of the semilunar valves
Answers
Answered by
2
Answer:
d. the closing of semilunar valves
Answered by
1
Answer:
d. The closing of semi lunar valves
Explanation:
The first sound or S1 is made by the closing of the tricuspid valve (of right atrium) and bicuspid valve (of left atrium), This is due to the contraction of the atria to prevent backflow of blood. So blood is pumped into the ventricles.
The second sound or S2 is made by closing of the semilunar valves which prevent backflow of blood into the atria.
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