The heart sounds, 'Lubb-Dubb,' originate from the closure of the AV valves (Lubb) and semilunar valves (Dubb).
The heart sounds, 'Lubb-Dubb,' are caused by the closing of the tricuspid and bicuspid valves (Lubb) and the semilunar valves (Dubb).
| Front | how much area of the leaf surface do stomata cover |
|---|---|
| Back | 1 to 2% |
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