Question

calcitonin works to: a regulate calcium levels in the body. b regulate glucose levels in the body. c regulate sodium levels in the body. d regulate the bodys metabolic rate.

Explanation:

Calcitonin is a hormone. Its main function is related to calcium - phosphate metabolism. It acts to lower blood calcium levels. For example, it inhibits osteoclast activity (osteoclasts break down bone and release calcium into the blood).

• Option B: Hormones like insulin and glucagon regulate glucose levels.
• Option C: Hormones such as aldosterone are more involved in sodium regulation.
• Option D: Thyroid hormones (e.g., thyroxine) are major regulators of the body's metabolic rate.

Answer:

A. regulate calcium levels in the body.