What is the primary function of magnesium in the body?

Magnesium plays a crucial role in various bodily functions, with its primary functions including the regulation of blood pressure and support of muscle function. It is an essential mineral that helps maintain normal muscle contractions and heart rhythms. Additionally, magnesium is involved in the regulation of vascular tone, which contributes to blood pressure regulation.

By aiding in the proper function of enzymes that relax blood vessels, magnesium helps prevent hypertension and supports cardiovascular health. Furthermore, it acts as a cofactor in over 300 biochemical reactions within the body, many of which directly influence muscle function and energy metabolism.

Though other options mention important functions, they do not encompass the primary roles of magnesium as effectively. For example, while magnesium does play a role in energy production, it does not primarily provide energy directly like carbohydrates or fats do. Similarly, it is not directly responsible for building muscle mass or transporting oxygen in the blood, functions that are more aligned with other nutrients like proteins and iron, respectively. Thus, the choice highlighting magnesium's role in regulating blood pressure and muscle function accurately reflects its most critical contributions to health.