Which is normally TRUE about the intrapleural pressure?
A. During a passive exhale, it increases to a value above atmospheric pressure.
B. It is lower than alveolar pressure.
C. It is always the same as atmospheric pressure during a passive exhale.
D. It is between +5 and +10 mmHg above atmospheric pressure at functional residual capacity.
E. It alternates between being less than, and greater than, atmospheric pressure.
Answer: B
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