Question
Biology Question on body fluids and circulation
Heart sound which is longer is
A
lub
B
dup
C
both equal
D
sometimes (a) and sometimes (b)
Answer
lub
Explanation
Solution
The first heart sound (lub) is caused by sudden closure of bicuspid and tricuspid valves and is longer than the second heart sound (dup) which is caused by closure of semilunar valves.