<prompt> Osteoclast has specific receptor for :Parathyroid hormone.Calcitionin.Thyroxin.Vit D3.  <response>: B i.e. CalcitoninCalcitonin exes its Ca2 lowering effect by inhibiting bone resorption. This action is direct and calcitonin inhibits the activity of osteoclase 2. It also increases Ca2 excretion in urine.HormonesBone cells on which theirreceptors are presentCalcitoninOsteoclastQParathyroidOsteoblastQVitamin DOsteoblastQCalcitonin exes its Ca2 lowering effect by inhibiting bone resorption. This action is direct and calcitonin inhibits the activity of osteoclase 2. It also increases Ca2 excretion in urine. 