UNC-Chapel Hill BIOL 252 - Urinary and Digestive Systems (4 pages)

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Urinary and Digestive Systems



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Urinary and Digestive Systems

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Urinary and Digestive Systems


Lecture number:
23
Pages:
4
Type:
Lecture Note
School:
University of North Carolina at Chapel Hill
Course:
Biol 252 - Fundamentals of Human Anatomy and Physiology
Edition:
1

Unformatted text preview:

BIOL 252 1st Edition Lecture 23 Outline of Last Lecture I Steps in Urine Formation II Renal Corpuscle III Regulation of Glomerular Filtration IV Proximal Convoluted Tubule Tubular reabsorption Outline of Current Lecture I PCT Tubular Reabsorption II Tubular Secretion III Loop of Henle IV Distal Convoluted Tubule and Collecting Duct V What about the loop VI Urine Storage and Elimination VII Digestive System VIII Saliva and Salivary Glands IX Layers of Digestive Tract X Peristalsis XI Stomach Current Lecture I II PCT Tubular Reabsorption a Why do peritubular capillaries absorb substances from ISF i High ISF hydrostatic pressure 1 Pushing inward because water and solutes accumulating in ISF ii Low blood hydrostatic pressure 8 mmHg 1 Volume of blood is much smaller than that going into glomerulus pressure drops 2 Because filtration removed fluid from blood iii High osmotic pressure high blood protein levels 1 Because filtration concentrated blood proteins Tubular Secretion a Waste removal urea uric acid bile acids ammonia catecholamines some drugs b Acid base balance H and HCO3i If pH is too low too acidic blood can get rid of H to fix the problem ii Reason urine is more acidic than blood These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III IV V Loop of Henle a Kidney has an osmolarity gradient b Descending limb reabsorbs water volume of filtrate 35 c Ascending limb reabsorbs NaCl volume of filtrate 20 d Generates salinity gradient enabling collecting duct to concentrate urine Distal Convoluted Tubule and Collecting Duct a Site of hormonally controlled reabsorption and secretion b ADH stimulated by high blood osmolarity detected by hypothalamus i Tells us need to conserve water c If we leave water alone we can have 20 leave the body as urine i With ADH put channels aquaporins for water to go back to blood ii Why does water leave through aquaporins 1 Because of the



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