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Normal expiration is a passive process, not an active one. It occurs due to the relaxation of respiratory muscles.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Expiration occurs when intrapulmonary pressure is higher than atmospheric pressure, forcing air out of the lungs.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
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