For air to flow into or out of the lungs, there must be

A. a volume gradient established between the atmosphere and the alveoli.
B. a temperature gradient between the atmosphere and the alveoli.
C. a diffusion gradient between the atmosphere and the alveoli.
D. a pressure gradient established between the atmosphere and the alveoli.
E. None of the choices are correct.


Answer: D

Anatomy & Physiology

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