Kidney_2008 - The Kidneys Functions of the Kidneys 1...

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Unformatted text preview: The Kidneys Functions of the Kidneys 1. Elimination of most waste products of metabolism which includes > Urea and Creatinine- derived from protein catabolism > Ketone- derived from fat catabolism 2. Must retain (reabsorb) molecules essential for normal body function, such as glucose, amino acids, and bicarbonate( buffer) 3. Kidneys are involved in maintaining a constant internal environment (homeostasis), including the regulation of electrolyte concentrations, fluid balance, and acid-base balance Kidney maintains the fluid volume of the blood by reabsorbing 98-99% of water Electrolyte and pH balance is maintained by selective reabsorption of ions such as sodium, potassium, and bicarbonate, and secretion of H+ Urinary System Kidney Structure Kidney Structure Each contains approximately 1 million functional units called nephrons Each nephron is composed of 1. Glomerulus (renal corpuscle) - highly permeable capillary bed at the end of arterioles 2. Renal Tubule- convoluted tubule lined by epithelial cells Renal Tubules The mouth of each tubule is the Bowman’s capsule , it envelopes the glomerulus Middle parts : Proximal convoluted, Descending, Ascending, Distal convoluted The last part of the renal tubule is the collecting duct which empties its content into the renal pelvis as urine, which is then funneled into the ureters. Nephron Glomerular capsule PCT Processes inside the Kidney Glomerular Filtration Tubular Reabsorption Tubular Secretion Glomerular Filtration...
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This note was uploaded on 12/22/2010 for the course BIOL 175L taught by Professor Wahba during the Fall '10 term at Coastline Community College.

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Kidney_2008 - The Kidneys Functions of the Kidneys 1...

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