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At the alveolar air–pulmonary blood interface, gas

At the alveolar air–pulmonary blood interface, gas exchange occurs by simple diffusion. Without certain adaptations, however, diffusion occurs too slowly to produce a viable level of gas exchange. Which of the following is a general adaptation of the respiratory system that increases the rate of diffusion?

Decreasing the concentration gradient across the respiratory surface

Having a thin respiratory surface

Having a small respiratory surface area

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