Q139 / 160 · JIPMER 2004 · Zoology

The first heart sound is produced when

  • A
    diastole begins
  • B
    semilunar valve close quickly
  • C
    interventricular pressure decreases
  • Correct answer
    D
    bicuspid and tricuspid valve close quickly

Solution

During working of heart two sounds are produced lub and dub. First sound (i.e., lub) is produced when auriculoventricular (tricuspid and bicuspid) valves are closed or at the end of diastole. The second sound (i.e., dub) is produced when semilunar valves at the base of dorsal aorta are closed or at the end of systole.

Hence, the correct answer is option: 'D'.

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