Biology (Zoology - Grade 11):High School learning: 3 Steps of urine formation br The 3 Detailed Structure of Urine Formation. br Glomerular Filtration- Filtration causes through pressure from following layers. br 1- Endothelium br 2- Epithelium br 3- Basement Membrane br Epithelial Cells (Podocytes): br Almost all constituent of blood plasma except the proteins pass into the lumen of Bowman’s capsule. br Almost 1100-1200 ml of blood is filtered by kidney per minute. It constitutes 15th of the blood pumped out by each ventricle of the heart in a minute. br 1: GLOMERULAR FILTERATION - br . Amount of filterate formed in per minute is called GLOMEULAR FILTERATION. br . Normal GFR=125 mlminute. br 2: RE ABSORPTION- Process of reclaiming water and the other substances from the tubular fluid Sodium Re absorption Water Re absorption Glucose br 180 liter of globular filtrate is produced daily. But alcohol 99 is absorbed by the renal tube. br So normal urine is released is 1.5 liter. br Substances like glucose, amino acids,Na+, etc in filtrate are reabsorbed actively. br Nitrogenous wastes are absorbed by passive transport. br - Why it has power of re absorption? br Simple cuboidal brush border epithelium of pct increases surface area of re absorption. br br Tubular Secretion-Cells of PCT and DCT maintain a ionic and acid based balance of body fluids by selective secretion of H+,K+ br br Concentration of Filtrate. br br Videos by Edupedia World(www.edupediaworld.com), Online Education. br All Rights Reserved.