During spontaneous inspiration alveolar pressure (PA) is about: ________________

a. ?1 cm H2O
b. +1 cm H2O
c. 0 cm H2O
d. 5 cm H2O

ANS: A
−1 cm H2O is the lowest alveolar pressure will become during normal spontaneous ventilation. During the exhalation of a normal spontaneous breath the alveolar pressure will become ?1 cm H2O.

Health Professions

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