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GS Paper IUPSC Prelims 2007
Health & Medicine
Question No. 423Interactive Test Mode
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+2-0.66

Q423. In human body, which one of the following hormones regulates blood calcium and phosphate?

In human body, which one of the following hormones regulates blood calcium and phosphate?

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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2007 • Science and Technology

Correct Answer: Option (C) — Parathyroid hormone

Concept & Option Breakdown

Standard Reference Verified

Parathyroid hormone (PTH or parathormone), secreted by the four parathyroid glands, is the primary endocrine regulator of calcium and phosphate homeostasis. It acts to increase serum calcium levels and decrease serum phosphate by:

  1. Enhancing osteoclastic bone resorption.
  2. Stimulating renal tubular calcium reabsorption and inhibiting phosphate reabsorption.
  3. Promoting the renal conversion of vitamin D into active calcitriol, which increases intestinal calcium absorption.
Elimination Heuristic & Exam Approach

PTH (Parathyroid hormone) along with Calcitonin directly controls systemic Calcium ($Ca^{2+}$) and Phosphate ($PO_4^{3-}$) levels.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2007 (Q423)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — Parathyroid hormone

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Frequently Asked Questions — UPSC Prelims 2007 Q423

What is the official answer for UPSC Prelims 2007 GS Paper I Question 423 (Science and Technology)?

The official UPSC answer key for this 2007 Science and Technology (Health & Medicine) question is Option (C): "Parathyroid hormone". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2007 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

PTH (Parathyroid hormone) along with Calcitonin directly controls systemic Calcium ($Ca^{2+}$) and Phosphate ($PO4^{3}$) levels.

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