Question

vitamin ds primary role in the body is regulation of blood ______ levels.
multiple choice
calcium
antibody
phosphorus
hormone

Explanation:

Vitamin D plays a crucial role in the body by facilitating the absorption of calcium from the intestines. This helps in maintaining proper blood calcium levels, which are essential for various physiological processes like bone health, nerve function, and muscle contraction. Antibodies are part of the immune system, phosphorus regulation is not the primary role (though it can have some secondary effects related to calcium - phosphorus balance), and while vitamin D has hormonal - like actions (as a secosteroid hormone), its primary role in the context of the question is related to calcium.

Answer:

calcium