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Intercalated ducts produce bicarbonate in the pancreas.
Valves are hollow shaped devices that regulate the flow of afluid opening or closing or by just obstructing various passageways. Their importance in the human is to prevent back flow of blood in the veins. By doing this it also stops blood from clotting in the veins.
yes, it is a afluid .beacause it flows and takes the shape of the container its been put into.