In which of the following microvilli are not present?
(A) Gallbladder (B) Duodenum (C) Collecting duct (D) Proximal convoluted tubule
(C) Ans: C. Collecting duct Microvilli - Finger-like cell surface extensions.Usually 0.1 mm in diameter & up to 2 mm long.Absorptive surfaces of epithelial enterocytes of small intestine - Arranged in regular parallel series & constitute striated border.In gallbladder epithelium & proximal kidney tubules - Are less regular constitute "brush border".