<prompt> Calicitonin causes hypocalcemia byInhibiting bone resorptionPromoting osteolysisDecreasing renal tubular reabsorption of calciumDecreasing absorption of phosphorus  <response>: Refer KDT 6e p 330 Calcitonin inhibits bone resorption by direct action on osteoclasts Calcitonin recetpors are present on osteoclasts It also inhibits proximal tubular calcium and and phosphate reabsorption by direct action on kidney However hypocalcemia which occurs overrides the direct action by decreasing the total Ca2 filtered at the Glomerulus 