What term is used to note the difference between inspiratory lung volume and expiratory lung volume at any given pressure?

a. Alveolar aphasia
b. Hysteresis
c. Pleural pressure variance
d. Transpulmonary pressures

ANS: B
Deflation of the lung does not follow the inflation curve exactly. During deflation, lung volume at any given pressure is slightly greater than it is during inflation. This difference between the inflation and deflation curves is called hysteresis.

Health Professions

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