alleryStart learning →Parathyroid hormone acts on blood calcium levels at which moment?
AWhen they drip too fast
BWhen they dry too slowly
CWhen they drift too high
DWhen they drop too low
Answer & Solution
Correct answer: D. When they drop too low
1. Two hormones between them hold blood calcium steady.
2. Calcitonin answers a rise in blood calcium.
3. Parathyroid hormone increases blood calcium levels when they drop too low.
4. So the two work in opposite directions.
_Source: OpenStax Anatomy and Physiology 2e (CC BY 4.0), Ch 17 'The Endocrine System', sections 17.1-17.9_
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