Question

which mineral, either too high or too low, will show up on an electrocardiogram before it shows up in blood values. sodium calcium potassium phosphorus

Explanation:

Potassium plays a crucial role in the electrical activity of the heart. Abnormal levels (either high - hyperkalemia or low - hypokalemia) can cause distinct changes on an electrocardiogram before significant changes are seen in blood values compared to the other minerals listed. Sodium, calcium and phosphorus have different primary effects on the body and their imbalances are not as characteristically and quickly reflected on an electrocardiogram as potassium imbalances.

Answer:

C. Potassium