MP Board · Class 11 · Biology · Breathing and Exchange of GasesDuring inspiration, the diaphragm:
Step-by-Step Solution
During inspiration, the diaphragm contracts, causing it to flatten. This increases the volume of the thoracic cavity along the anteroposterior axis, reducing the pressure inside the lungs compared to atmospheric pressure.
Detailed Options Breakdown
Option : Relaxes and becomes dome-shaped
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Breathing and Exchange of Gases.
Option 1: Contracts and flattens (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 2: Remains unchanged in shape
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Breathing and Exchange of Gases.
Option 3: Bends upwards into the thoracic cavity
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Breathing and Exchange of Gases.
💡 Study Guide: This question tests core syllabus concepts from Breathing and Exchange of Gases. For formulas, key summaries, and mock exam reference guides, read the full Breathing and Exchange of Gases Revision Notes.