Question

hypocalcemia stimulates _, which leads to _. growth hormone; increased osteoblast activity parathyroid hormone; increased osteoclast activity calcitonin; more urinary phosphate reabsorption calcitriol; more urinary phosphate excretion

Explanation:

Hypocalcemia (low blood - calcium levels) stimulates the parathyroid gland to secrete parathyroid hormone (PTH). PTH acts on bones, increasing osteoclast activity to release calcium from the bone matrix into the bloodstream, raising blood - calcium levels. Growth hormone is not directly related to calcium regulation in response to hypocalcemia. Calcitonin lowers blood - calcium levels and is not stimulated by hypocalcemia. Calcitriol mainly regulates calcium and phosphate absorption in the intestines and does not have the described relationship with hypocalcemia and urinary phosphate excretion in this context.

Answer:

parathyroid hormone; increased osteoclast activity