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Parathormone, secreted by the parathyroid glands, mainly regulates the body's level of:
A{'text': 'Calcium in the blood'}
B{'text': 'Glucose in the blood'}
C{'text': 'Sodium in the blood'}
D{'text': 'Cholesterol in the blood'}
Answer & Solution
Correct answer: A. {'text': '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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