<prompt> PTH does not cause:Maintains serum Ca2Ca2 retentionDecreased PO43- excretionMay cause osteolysis  <response>: Ans. is c decreased P043- excretionParathyroid hormone decreases the reabsorption of P043- in proximal convoluted tubule of kidney. This increases their excretion from the kidney.Effect of parathyroid hormoneon calciumit increases serum calcium level byStimulates reabsorption of Ca by kidneyStimulates renal activation of vit. D which increases intestinal absorption of calciumOn PhosphorusDecrease the level of P043- in Serum byDecreasing P043- reabsorption in kidney. 