Combined Solid and Water Transport
See Chapter 10: Renal Tubules and Collecting Ducts.
Active Transport
Active transport is the transport of substances through the cell membrane
by means of an energy-consuming transport system (transport
ATPase). Here, again, ATP serves as universal fuel. Such a transport
process can move a substance through the membrane against a concentration
gradient (Fig. 1.14). Thus cells have the ability to maintain in
their interior stable ion concentrations, for example, that are clearly
different from their concentrations in the extracellular fluid. These active
transport processes are served by specialized proteins in the cell
membrane that can move several ions simultaneously. In this process,
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