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Valves are made from metals, including brass, bronze, iron, steel, and alloys, as well as from plastics.

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14y ago

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What is a heart's lub-dub?

They are the representation of the heart's sounds, one made by interior valves closing and one by the exterior valves at the exit of the ventricles.Lub: Valves closing between atria and ventricles.Dub: Aortic and pulmonary valves closing (semilunar valves).


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lup - dup (when the valves between the atria and venticles close, the "lup" sound is made. When the valves between the venticles and blood vessels close, the "dup" sound is made).


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