BIOL 2P97 Study Guide - Final Guide: Sucrose, Antidiuretic, Osmosis

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Renal (urinary) system consists of the kidneys, the ureters, the bladder and the urethra. This high rate of perfusion helps the kidneys to rapidly filter out any nasties entering the blood from, for example, the digestive system. Kidneys also function in maintaining the molecular composition of blood by secreting or excreting specific molecules. Note in the table below that for molecules like potassium, calcium, and others there is a relatively narrow range that can be tolerated in the body. This is why people with dysfunctional kidneys must have dialysis-to make sure that the molecular composition of blood is maintained over time. This figure illustrates one reason why maintaining the levels of specific molecules in blood is important. Blood ionic composition is about the same as that of the interstitial fluid. Note how na+ is much higher outside of the cell than inside. This gradient is crucial to many cellular processes, not least of which is the action potential.

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