During exhalation of the first breath, the lungs do not collapse completely again in a newborn infant because
A) the incoming air is warmed by the upper portion of the respiratory tract, and this causes
the lung tissues to expand and remain larger in size than previously, even when emptied
of air.
B) surfactant covering the alveolar surfaces prevents their collapse.
C) exhalation is never as forceful as is inhalation.
D) cartilages and connective tissues keep the conducting passageways closed.
E) None of the answers are correct.
B) surfactant covering the alveolar surfaces prevents their collapse.
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