NCERT Class 11 Biology — Parathyroid hormone (PTH) increas

NCERT · Class 11 · Biology · Chemical Coordination and IntegrationParathyroid hormone (PTH) increases blood calcium levels by:

Step-by-Step Solution

Parathyroid hormone (PTH) is a hypercalcemic hormone. It increases the Ca2+ levels in the blood by acting on bones (stimulating bone resorption/demineralization) and also by reabsorption of Ca2+ by the renal tubules and digestion/absorption of Ca2+ from the digested food.

Detailed Options Breakdown

Option : Stimulating bone resorption (Correct Answer)

Correct choice. Refer to the step-by-step verified solution guidelines above for details.

Option 1: Promoting bone deposition

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Chemical Coordination and Integration.

Option 2: Decreasing calcium reabsorption in kidneys

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Chemical Coordination and Integration.

Option 3: Inactivating Vitamin D

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Chemical Coordination and Integration.

💡 Study Guide: This question tests core syllabus concepts from Chemical Coordination and Integration. For formulas, key summaries, and mock exam reference guides, read the full Chemical Coordination and Integration Revision Notes.

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