the acute effect of i.v . and direct intrarenal arterial infusion of 25-hydroxycholecalciferol ( 25hcc ) and 1,25-dihydroxycholecalciferol ( 1,25-dhcc ) on renal handling of phosphorus was evaluated in the following groups of rats : ( a ) intact animals , ( b ) parathyroidectomized ( ptx ) hypocalcemic rats , ( c ) ptx rats in which normocalcemia was maintained with calcium supplements and ( d ) ptx animals in which urinary phosphorus was augmented by ( i ) i.v . sodium phosphate , ( ii ) expansion of the extracellular fluid volume with normal saline , and ( iii ) i.v . parathyroid hormone ( pth ) .
C0020598
hypocalcemic
C0030520
parathyroid hormone