Question

Liquid which collects in the cavity of Bowman's capsule is

• A. Blood plasma minus blood proteins
• B. Glycogen and water
• C. Urea, glycogen and water
• D. Urea

Answer 1

The correct option is A Blood plasma minus blood proteins

The first step in urine formation is the filtration of blood, which is carried out by the glomerulus and is called as glomerular filtration. On an average,1100-1200 ml of blood is filtered by the kidneys per minute which constitute roughly 1/5th of the blood pumped out by each ventricle of the heart in a minute. The glomerular capillary blood pressure causes filtration of blood through 3 layers, i.e., the endothelium of glomerular blood vessels, the epithelium of Bowmans capsule and a basement membrane between these two layers. The epithelial cells of Bowmans capsule called as podocytes are arranged in an intricate manner so as to leave some minute spaces called filtration slits or slit pores. Blood is filtered so finely through these membranes, that almost all the constituents of the plasma except the proteins pass onto the lumen of the Bowmans capsule. Therefore, it is considered as a process of ultrafiltration.