Read This Selection: Calcitonin Stimulates Osteoblastic Activity to Promote Calcium

Read this selection: Calcitonin stimulates osteoblastic activity to promote calcium deposition and bone formation.It is secreted in response to hypercalcemia.Which of the following statements best describes the function of this hormone?

A) Secretion is increased when the blood calcium is decreased.
B) Secretion is increased when the blood calcium is increased.
C) Osteoclasts and osteoblasts are equally stimulated by calcitonin.
D) High levels could cause osteoporosis.
E) The major target tissue is in the thyroid gland.