Question

Short / Long type answer type questions.
The pumping heart produces two characteristic sounds lub and dup. What structures cause these sounds and when are these produced?

Answer 1

• In a healthy individual, there are two normal heart sounds called lub and dub.
  
• Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole.
  
• The second heart sound dub is associated with the closure of the semilunar valves at the beginning of diastole.