alleryStart learning →Calcitonin is released from which gland, and in response to what?
AThe parathyroid, when calcium is high
BThe parathyroid, when calcium is low
CThe thyroid, when blood calcium is low
DThe thyroid, when blood calcium is high
Answer & Solution
Correct answer: D. The thyroid, when blood calcium is high
1. Calcium and phosphate are regulated by parathyroid hormone, calcitriol and calcitonin.
2. Calcitonin comes from the thyroid gland, not the parathyroid.
3. Its trigger is an elevated blood calcium level.
4. It then raises osteoblast activity, which pulls calcium out of blood and into bony matrix.
5. Parathyroid hormone is the mirror image, released when blood calcium falls.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 26 "Fluid, Electrolyte, and Acid-Base Balance", section Regulation of Calcium and Phosphate_
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