Yes, there is a relationship between the speed of fluid flow and how much fluid remains behind. In faster-flowing fluids, there is typically less fluid left behind as the flow carries more of the fluid forward. Slower-flowing fluids tend to leave more fluid behind due to increased frictional forces.
Intercalated ducts produce bicarbonate in the pancreas.
yes, it is a afluid .beacause it flows and takes the shape of the container its been put into.
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.