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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
The larynx contains the epiglottis, which prevents food from entering the trachea during swallowing.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
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