Question

if a persons diet is deficient in vitamin d, what triggers calcium release into the blood?
calmodulin
calcitonin
parathyroid hormone
calcitriol
i dont know yet

Explanation:

Calcium homeostasis is regulated by multiple factors. Parathyroid hormone (PTH) is secreted by the parathyroid glands. When a person is deficient in vitamin D which is important for calcium absorption, PTH levels increase. PTH acts on the bones, kidneys, and intestines to increase calcium levels in the blood. It stimulates the release of calcium from bones, enhances calcium re - absorption in the kidneys, and indirectly promotes calcium absorption in the intestines through its effect on vitamin D activation. Calmodulin is a calcium - binding protein that regulates cellular processes once calcium is present. Calcitonin acts to lower blood calcium levels. There is no such thing as "calicium" in this context.

Answer:

C. Parathyroid hormone