alleryStart learning →Parathyroid hormone is secreted in response to which change in the blood?
AA rise in blood calcium
BA fall in blood calcium
CA fall in blood sodium
DA rise in blood glucose
Answer & Solution
Correct answer: B. A fall in blood calcium
1. Parathyroid hormone is the major hormone regulating blood calcium.
2. The chief cells of the parathyroid glands release it when blood calcium falls.
3. A negative feedback loop then applies, because rising calcium inhibits further release.
4. A rise in calcium instead triggers calcitonin from the thyroid, so the rising-calcium option belongs to the other hormone.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 17 "The Endocrine System", section 17.5 The Parathyroid Glands_
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