Brush border is characteristic of [1990] (a) neck of nephron (b) collecting tube (c) proximal convoluted tubule (d) all the above
Option C.Nephrons are small, highly coiled tubular structures that contain a ‘renal corpuscle’ from where the blood plasma is filtered and a ‘renal tubule’ into which the filtrate enters and passes through. Renal tubules have four differentiated regions namely the proximal tubule (PCT), the loop of Henle, and the distal tubule (DCT). Many nephron distal convoluted tubules open into a straight tube called a collecting duct. The proximal convoluted tubule is the anterior-most portion of the renal tubules or the first tubule in which the filtrate enters from the bowman’s capsule. It is lined by cuboidal epithelium, the cells of which bear microvilli or finger- like processes at their apical portion.This gives a brush-border appearance of the proximal convoluted tubule. The basal portion of these cells bears numerous mitochondria to perform the active reabsorption of salts.
