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two RENAL CORPUSCLES and RENAL TUBULES in a Human KIDNEY, 50X. The renal corpuscles are fundamental Filtration units in the kidney. The solid mass inside is the GLOMERULUS surrounded by a clear space, the BOWMAN'S (or GLOMERULAR) CAPSULE. The glomerulus is a mass of Capillaries--blood pressure forces the liquid portion of the blood (plasma) through the capillary membranes into the Bowman's Capsule. The filtrate then enters the renal tubules where the physiological processes of reabsorption and secretion convert the filtrate to urine. All of these structures are part of the NEPHRON--the fundamental physiological unit of the kidney--about one million are present in each kidney.