alleryParathormone, secreted by the parathyroid glands, mainly regulates the body's level of:
ACalcium in the blood
BGlucose in the blood
CSodium in the blood
DCholesterol in the blood
Answer & Solution
Correct answer: A. Calcium in the blood
1. Parathormone (PTH) controls the balance of one specific mineral.
2. It maintains **calcium** levels in blood and bones.
3. Glucose is regulated by insulin and glucagon; sodium by aldosterone (not part of this chapter); cholesterol is not directly regulated by PTH.
4. So PTH primarily controls calcium.
_Source: Selina Concise ICSE Class 8 Biology Ch 5 "Endocrine System and Adolescence", Major endocrine glands_
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