Under which internal conditions does air flow into the lungs? - In order for this to happen,
intrapulmonary pressure must increase
Under which internal conditions does air flow out of the lungs? - In order for this to happen,
intrapulmonary pressure must decrease
What results from the contraction of the diaphragm and external intercostal muscles? - When these
muscles contract, superoinferior volume increase and the anteroposterior and later dimensions increase
What temporary advantage does the substantial increase in chest circumference during forced
inspiration create? - It will allow an increase in intrapulmonary volume, lowering air pressure inside the
lungs and causing gases inside to expand to fill the space
Why is the presence of a partial vacuum between the pleural membranes necessary? - The presence of
this allows for proper inflection of the lungs
What would occur if an opening were made in the chest cavity by say, a puncture wound? - This would
cause intrapleural pressure to equal the atmospheric pressure, resulting in the recoiled and collapse of
the lungs
What is Residual Volume? - This is the volume of air present in the lungs after a forceful expiration
What is Expiratory reserve volume? - This is the volume of air that can be expired forcibly after a normal
expiration
What is Tidal Volume? - This is the volume of air that if breathed in and out during a normal respiration
What is Inspiratory reverse volume? - This is the volume of air that an be inspired forcibly after a normal
inspiration
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