alleryStart learning →Which cells secrete calcitonin, and what does it do to blood calcium?
AParafollicular cells, and it lowers blood calcium
BParafollicular cells, and it raises blood calcium
CFollicle cells, and it lowers blood calcium levels
DChief cells, and it raises blood calcium levels
Answer & Solution
Correct answer: A. Parafollicular cells, and it lowers blood calcium
1. Calcitonin comes from the parafollicular cells, also called C cells, that stud the tissue between follicles.
2. It is released when blood calcium rises.
3. It lowers blood calcium by inhibiting osteoclasts, cutting intestinal calcium absorption and raising calcium loss in urine.
4. Follicle cells make triiodothyronine and thyroxine, and chief cells of the parathyroid make the hormone that raises calcium.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 17 "The Endocrine System", section 17.4 The Thyroid Gland_
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