What is one way that calcitonin and parathyroid hormone maintain homeostasis?

A.
Calcitonin stimulates the bones to absorb calcium when calcium levels are too low, while parathyroid hormone stimulates the bones to excrete calcium when calcium levels are too high.
B.
Calcitonin stimulates the kidneys to excrete calcium when calcium levels are too high, while parathyroid hormone stimulates the kidneys to absorb calcium when calcium levels are too low.
C.
Calcitonin stimulates the bones to excrete calcium when calcium levels are too high, while parathyroid hormone stimulates the bones to absorb calcium when calcium levels are too low.
D.
Calcitonin stimulates the kidneys to absorb calcium when calcium levels are too low, while parathyroid hormone stimulates the kidneys to excrete calcium when calcium levels are too high.

Calcitonin is involved in helping to regulate levels of calcium and phosphate in the blood, opposing the action of parathyroid hormone. This means that it acts to reduce calcium levels in the blood. When bone is broken down, the calcium contained in the bone is released into the bloodstream.

Answer Link

TenishaTon TenishaTon · Answer 2 · 2019-10-16T12:22:13+02:00

Answer: Option C

Explanation:

Calcitonin plays a minor role in controlling the levels of calcium in the bloodstream. It inhibits the activity of osteoclasts, which comprises of the cell that is responsible for the breaking down of bone.

When the bone is broken down its concentration in the blood stream increases. It stimulates the kidney to absorb the calcium when it is too low.

While the parathyroid hormone stimulates the kidney to excrete calcium when calcium levels are high,.