Explain heart sounds.
During each cardiac cycle, two prominent sounds are produced which can be easily heard through a stethoscope. The first heart sound is called 'lub'. This sound is associated with the closure of the tricuspid and bicuspid valves.
The second heart sound is called 'dub'. This sound is associated with the closure of the semilunar valves. These sounds are of clinical diagnostic significance as they help in assessing the health of the heart.
Explanation
The answer is derived directly from the provided text which states that two prominent sounds occur during each cardiac cycle. The first sound (lub) is explicitly linked to the closure of the tricuspid and bicuspid valves, while the second sound (dub) is linked to the closure of the semilunar valves. The text also mentions their clinical diagnostic significance.