a. True Intrapleural pressure is negative throughout the cycle and is minimum at the end of inspiration; it becomes more negative with a deeper inspiration.
b. True Intrapulmonary pressure (that is intra-alveolar pressure) reaches its minimum around mid-inspiration and its maximum around mid-expiration.
c. False The flow record closely follows the intrapulmonary pressure record B since flow is directly related to pressure gradient between alveoli and atmosphere; record C shows changes in lung volume.
d. False Compliance, the volume change for a given pressure change, is similar in both; though the pressure gradient is increased about three times in the second cycle, so is the tidal volume.
e. False Airflow is zero at end inspiration; it is maximum in mid-inspiration and midexpiration.