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The diaphragm moves actively during the breathing cycle, contracting during inspiration and relaxing during expiration.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
During expiration, the diaphragm relaxes and moves upward, decreasing thoracic volume and pushing air out.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
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