As Plasma Levels of Calcium Decrease

Question

As plasma levels of calcium decrease
A) insulin is secreted.
B) the parathyroid glands secrete an osteoclastic hormone.
C) the kidneys excrete calcium and phosphorus.
D) calcitonin is secreted.

Accepted Answer

When plasma levels of calcium decrease, the parathyroid glands secrete parathyroid hormone (PTH), which stimulates osteoclasts to break down bone tissue and release calcium into the bloodstream.