( A ) Henle's loop : most reabsorption of the major substances from the glomerular filtrate
( B ) Distal convoluted tubule : re-absorption of $K^+$ ions into the surrounding blood capillaries
( C ) Podocytes : Create minute spaces (slit pores) for the filtration of blood into the Bowman's capsule
( D ) Afferent arteriole : carries the blood away from the glomerulus towards renal vein
