A) 1
B) 4
C) 8
D) 10
Correct Answer: A
Solution :
Between breathing (inspiration and expiration) the intrapleural pressure (pressure inside thin double membrane lung) is approximately 1 mmHg less than atmospheric pressure. In normal respiration, the simultaneous relaxation or inspiratory muscle reduce the volume of thoracic cavity in ail direction. As a result the atmospheric pressure inside the lung increase by 3-4 mmHg in normal expiration and 4-6 mmHg in a forced expiration.
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