Question:
Which of the following does NOT take place during inspiration?
Which of the following does NOT take place during inspiration?
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Inspiration is an active process; expiration at rest is passive.
Updated On: Feb 9, 2026
- Intercostal muscles contract
- Muscles of diaphragm relax
- Ribs are pulled outward
- Volume of thoracic cavity increases
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The Correct Option is B
Solution and Explanation
Step 1: Understanding inspiration.
Inspiration is the process of intake of air into the lungs and involves active muscular movements.
Step 2: Events during inspiration.
During inspiration, the diaphragm contracts and flattens, intercostal muscles contract, ribs move outward, and the volume of the thoracic cavity increases.
Step 3: Analysis of options.
(A): Correct event during inspiration.
(B): Incorrect — diaphragm muscles relax during expiration, not inspiration.
(C): Correct event during inspiration.
(D): Correct event during inspiration.
Step 4: Conclusion.
The event that does NOT occur during inspiration is relaxation of diaphragm muscles.
Inspiration is the process of intake of air into the lungs and involves active muscular movements.
Step 2: Events during inspiration.
During inspiration, the diaphragm contracts and flattens, intercostal muscles contract, ribs move outward, and the volume of the thoracic cavity increases.
Step 3: Analysis of options.
(A): Correct event during inspiration.
(B): Incorrect — diaphragm muscles relax during expiration, not inspiration.
(C): Correct event during inspiration.
(D): Correct event during inspiration.
Step 4: Conclusion.
The event that does NOT occur during inspiration is relaxation of diaphragm muscles.
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