ACE Health Coach Certification Practice Test 2026 – Complete Prep Guide

Phosphorus is essential for the mineralization of bones and teeth, working alongside calcium to form a strong and healthy skeletal structure. About 85% of the phosphorus in the human body is found in bones and teeth, where it combines with calcium to create hydroxyapatite, the mineral compound that gives bones their hardness. This relationship is vital because adequate levels of both calcium and phosphorus are necessary to maintain bone density and strength.

In contrast, iron primarily plays a role in oxygen transport within the body and does not directly contribute to bone mineralization. Iodine is crucial for thyroid hormone production, which regulates metabolism but is not involved in bone structure. Vitamin D, while important for the absorption of calcium and phosphorus and overall bone health, does not contribute directly to the mineralization process itself but instead facilitates the availability of these minerals for use in bone formation.

Thus, phosphorus is directly responsible for the mineralization of bones and teeth, making it the correct choice in this context.