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BIOL 3P95 (5)

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Brock University
Daniel Glenday

Functions of the urinary system Filter blood plasma oElectrolyte regulationWhen the extracellular fluid has an excess of water or an electrolyte the kidneys can eliminate it in the urineoMaintain water balance When the extracellular fluid has a deficit of water or an electrolyte the kidneys limit further losses in the urineRegulate blood volume and blood pressure controlMaintain proper osmolality of body fluids primarily through regulating HO 2balance Regulate the quantity and concentration of most ECG ions Excreting eliminating the end products wastes of bodily metabolism Endocrine function kidneysoRenin EPO2oConverting vitamin D into its active form calcitrol Ca homeostasisHelp maintain acidbase balance of the blood Detoxify free radicals and drugs Urinary System Composed of 6 organs2 kidneys2 ureters Urinary bladder oLined with a smooth muscle called the detrusor muscleUrethra Kidneys Lie near the posterior abdominal cavity wall Each kidney is supplied with a renal artery and a renal vein Acts on plasma flowing though it to produce urine Formed urine drains into the renal pelvisoLocated at medial inner core of each kidney Main kidney functions oPrimarily responsible for maintaining stability of ECF volume electrolyte composition and osmolality oMain route for eliminating potentially toxic metabolic wastes foreign compounds from the body Right kidney is slightly lower than the left kidney Above each kidney is an adrenal gland OsmolalityMolethe count of a number of particles where one mole is equal to 6021023 particles avagrados numberMolaritymmolL MolalitymmolKgOsmolarityosmotic concentrationtotal number of osmotically active particles in a solution L equal to the sum of the molarities of all the solutes present in that solution For most biological systems molarity and molality of a solution are nearly exactly equal because the density of water is 1 KgL Osmolarity There is a slight difference between molarity and molality in plasma because of the nonaqueous components present such as proteins and lipids 6 of total volume Thus serum is only 94 water and the molality of a substance in serum is about 6 higher than its molarity Except in unusual circumstances this difference is unimportant and the terms molarity and molarity are used interchangeably
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