Biology (Zoology - Grade 11):High School learning: 3 Steps of urine formation The 3 Detailed Structure of Urine Formation. Glomerular Filtration- Filtration causes through pressure from following layers. 1- Endothelium 2- Epithelium 3- Basement Membrane Epithelial Cells (Podocytes): Almost all constituent of blood plasma except the proteins pass into the lumen of Bowman’s capsule. Almost 1100-1200 ml of blood is filtered by kidney per minute. It constitutes 1/5th of the blood pumped out by each ventricle of the heart in a minute. 1: GLOMERULAR FILTERATION - . Amount of filterate formed in per minute is called GLOMEULAR FILTERATION. . Normal GFR=125 ml/minute. 2: RE ABSORPTION- Process of reclaiming water and the other substances from the tubular fluid Sodium Re absorption Water Re absorption Glucose 180 liter of globular filtrate is produced daily. But alcohol 99% is absorbed by the renal tube. So normal urine is released is 1.5 liter. Substances like glucose, amino acids,Na+, etc in filtrate are reabsorbed actively. Nitrogenous wastes are absorbed by passive transport. - Why it has power of re absorption? Simple cuboidal brush border epithelium of pct increases surface area of re absorption.
Tubular Secretion-Cells of PCT and DCT maintain a ionic and acid based balance of body fluids by selective secretion of H+,K+
Concentration of Filtrate.
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