What is the primary role of Sodium in the body as indicated in the Basic Metabolic Panel?

The primary role of sodium in the body, particularly as indicated in the Basic Metabolic Panel, relates to its involvement in nerve and muscle function. Sodium is essential for maintaining the resting membrane potential and the generation of action potentials in neurons and muscle cells. This means that the movement of sodium ions across cell membranes is critical for the transmission of electrical impulses, allowing for proper communication between nerve cells and the contraction of muscles.

In the context of the Basic Metabolic Panel, monitoring sodium levels provides insight into a person's fluid balance, electrolyte levels, and overall neurological and muscular health. A deficit or excess of sodium can lead to various health issues, affecting both the nervous system and muscular performance. Thus, sodium's primary function centers around facilitating interactions between nerves and muscles, making option C the correct answer.