They excrete the waste product urea, control the concentrations of water and salt in the body fluids, and regulate the acidity of the blood. Most of the contents of the blood except the cells and larg...They excrete the waste product urea, control the concentrations of water and salt in the body fluids, and regulate the acidity of the blood. Most of the contents of the blood except the cells and large protein molecules filter from the glomerulus into the (Bowmans) capsule. The fluid flows to a looped portion of the tubule called the Loop of Henle where water is reabsorbed and then to another coiled part of the tubule (distal convoluted tubule) where more reabsorbtion and secretion takes place.
