Differentiate between Inspiration and Expiration with respect to position of diaphragm and working of intercostal muscles.

Q.14 Differentiate between Inspiration and Expiration with respect to position of diaphragm and working of intercostal muscles.

Doubtly Asked 29 Oct 2026 Board exam · July 2025 hsc 12th Save WhatsApp Report

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Answer:

Point	Inspiration	Expiration
Position of diaphragm	Diaphragm contracts and becomes flattened (moves downward), increasing the vertical size of the thoracic cavity.	Diaphragm relaxes and becomes dome-shaped (moves upward), decreasing the vertical size of the thoracic cavity.
Intercostal muscles	External intercostal muscles contract and internal intercostal muscles relax; ribs and sternum move upward and outward.	External intercostal muscles relax and internal intercostal muscles contract (in forced expiration); ribs and sternum move downward and inward.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report

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