A 52-year-old grocery clerk has been experiencing a decrease in serum calcium. The client has undergone diagnostics, and the health care provider proposes that the calcium level fluctuation is due to altered parathyroid function. What is the role of parathormone?
a. Promotes urinary secretion of calcium
b. Decreases serum calcium level
c. Increases serum calcium level
d. Inhibits release of calcium into extracellular fluid