Thyroid Hormones and Metabolic Regulation — NEET Biology
✅ Asked in NEET 2023Which of the following is NOT involved in calcium homeostasis? (NEET 2023)
Which of the following is NOT involved in calcium homeostasis? (NEET 2023)
A person with abnormally low basal metabolic rate is likely to be suffering from deficiency of: (NEET 2022)
Answer & NCERT explanation
Correct answer: D — Thyroxine
Thyroxine is NOT involved in calcium homeostasis. PTH increases blood calcium, calcitonin decreases it, and 1,25-dihydroxycholecalciferol (active vitamin D) enhances calcium absorption from intestine. Thyroxine regulates metabolism, not calcium levels. NCERT explains calcium homeostasis involves PTH, calcitonin, and vitamin D metabolites only.
Read more NCERT concept on the PYQ
Thyroid hormones play an important role in the regulation of the basal metabolic rate. These hormones also support the process of red blood cell formation. Thyroid hormones control the metabolism of carbohydrates, proteins and fats. Maintenance of water and electrolyte balance is also influenced by thyroid hormones. Thyroid gland also secretes a protein hormone called thyrocalcitonin (TCT) which regulates the blood calcium levels.
The NTA focuses on thyroid hormones' role in regulating basal metabolic rate and controlling metabolism of carbohydrates, proteins, and fats—not their calcium regulation role. Students commonly confuse thyrocalcitonin (TCT) with parathyroid hormone; remember that TCT lowers blood calcium while PTH raises it. NEET questions test whether you know thyroid hormones increase metabolic rate and energy expenditure, while TCT is specifically for calcium homeostasis. Focus on the distinct metabolic vs. mineral regulation functions to avoid mixing up thyroid and parathyroid functions—a frequent NEET trap question.
What does NCERT say about Thyroid hormones play important?
Has this concept appeared in NEET?
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Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.