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Unformatted text preview: Lab 7: Renal Lab Functions of the Renal System: 1) regulation of extracellular fluid. Homeostatic control of (a) electrolytes (b) pH (c) H 2 O content and (d) total fluid volume Renal system : Kidneys, bladder, urinary tracts and renal blood supply Kidneys: Basic functional unit: NEPHRON Nephron: Bowmans capsule- across from the bowmans capsule dense network of capillaries Glomerulus- Glomerulus filters protein-free filtrate into nephron- Glomerular filtration rate (on an average 125 mL/min) affected by MAP- Lots of volume reabsorbed else we would be permanently dehydrated Proximal Tubule: Active absorption of Na + , Cl- follows passively. Also active re- absorption of glucose and amino acids and K + . Also we see a passive reabsorption of urea. H 2 O follows the osmotic gradient set by these ions ie. it is reabsorbed too. Loop of Henle: Functions to create a vertical osmotic gradient in the medulla (300 mOsm at the top and 1200 mOsm at the bottom produces urine of varying consentrations...
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- Spring '08