Tiffany is a strict vegan and does not consume calcium-rich plant foods or take calcium supplements. Which molecule is most responsible for maintaining her blood calcium levels in the normal range?

Question

Tiffany is a strict vegan and does not consume calcium-rich plant foods or take calcium supplements. Which molecule is most responsible for maintaining her blood calcium levels in the normal range? ​

Quizplus · Accepted Answer

Parathyroid hormone is responsible for increasing blood calcium levels by stimulating the release of calcium from bones and enhancing calcium absorption from the digestive tract. In the absence of adequate calcium intake, the body relies on parathyroid hormone to maintain blood calcium levels within the normal range. Calmodulin is a calcium-binding protein involved in diverse cellular processes while hydroxyapatite is a mineral compound that forms the major component of bones and teeth. Calcitonin is a hormone that lowers blood calcium levels by promoting calcium storage in bones. However, in this case, Tiffany does not consume enough calcium-rich plant foods, and therefore, calcitonin is not the primary hormone responsible for regulating her blood calcium levels.

Tiffany Is a Strict Vegan and Does Not Consume Calcium-Rich