Which of the following is true concerning the lub-dub sounds of the heart:
a. first sound is longer and louder and is caused by closure of AV valves, second is shorter and sharper and is caused by closure of semilunar valves
b. the first sound is shorter and sharper and is caused by closure of the tricuspid valve, the second sound is longer and louder and is caused by closure of the mitral valve.
Answer: A
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