Final answer:
Potassium is the mineral chemical element that helps nerves and muscles communicate. It is regulated in the body through the sodium-potassium pumps in cell membranes and is necessary for proper body functioning.
Step-by-step explanation:
Potassium is the mineral chemical element that helps nerves and muscles communicate. It is largely present in intracellular fluid and plays a role in establishing the resting membrane potential in neurons and muscle fibers. Potassium is regulated in the body through the sodium-potassium pumps in cell membranes and is necessary for proper body functioning.