Blood calcium levels are maintained because the bones act as a calcium sink in which calcium can either be stored or procured based on the body's needs. If a person secretes too much parathyroid hormone (one possible factor in the bone disease osteoporosis), what happens to calcium levels in the body?

• A. Bone stores are depleted and the kidney move calcium.
• B. Bone stores are depleted and the kidney' retain calcium.
• C. Blood levels of calcium may read high
• D. Both [b] and [c]