The same is surrounded by peritubular capillaries. It passes into proximal convoluted tubule. Nephric filtrate is also called primary urine. Its volume is 125 ml/min (180 litres/day). The product is called nephric or glomerular filtrate. All small volume solutes (e.g., urea, uric acid, amino acids, hormones, glucose, ions, vitamins) and water are filtered out and enter the Bowmans’ capsule. As a result it undergoes pressure filtration or ultrafiltration. Blood flows inside glomerulus under pressure due to narrowness of efferent arteriole. It has four steps – ultra filtration, selective reabsorption, secretion and concentration. The entire kidney tubule is surrounded by blood capillaries called vasa recta. The ascending limb of Henle’s loop again gives second convoluted tubule opening into collecting tubule and finally into lager tubule known as duct of Bellini, which opens into the pelvis of ureter at the apex of renal pyramids. (C) Distal tubule – Join collecting tuble. (B) Henle loop – It is a ‘U’ shape thin tube like structure. (A) The proximal tubule – Nearest Bowman’s capsule. The malpighian tubule is divided into 3 parts forming a shaped convoluted tubule.
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