Nephrons, or kidneys are part of the human body and some other organisms. They function as a regulator of water's and soluble material's concentration in the body, a filter of blood, and the excretion simulator if wastes through urine. In addition, nephrons also regulate blood pressure, control the production of red blood cells, and regulate calcium levels in the body. Therefore, nephrons are important in keeping the body clean and stable through its function as a regulator of concentrations and its function as a filter of wastes.
Counter Currents
In relations of counter currents, the loop of henle(counter current mutliplier), and the bowman capsule is involved. Kidneys are similar to the counter current exchange system in their ability to maintain a certain concentration of solute in order to produce urine.
Hydrostatic Skeletons
Kidneys are similar to hydrostatic skeletons, because of their ability to excrete wastes. kidneys excrete urine, where waste is taken from the organism's blood. In terms of hydrostatic skeletons, wastes is also excreted in a similar way. Such example is seen in worms, they are invertebrates that have hydrostatic skeletons which allow them to excrete wastes.
Sources:http://science.howstuffworks.com/environmental/life/human-biology/kidney.htm
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