Select the statement that is TRUE during expiration?
a. Transpulmonary pressure (Ptp)= 0
b. Alveoli pressure (Palv)? atmospheric pressure (Patm)= 0, and Palv = Patm
c. Palv is greater than Patm, Palv ? Patm is positive and airflow is outward
d. Intrapleural pressure (Pip) becomes more negative
Ans: c. Palv is greater than Patm, Palv ? Patm is positive and airflow is outward
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