In which structure does diffusion of oxygen to capillaries not play a major role?

Name: In which structure does diffusion of oxygen to capillaries not play a major role?
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Terminal bronchioles are part of the conducting zone of the respiratory system, where the primary function is to conduct air to the respiratory zone, not gas exchange. Diffusion of oxygen to capillaries primarily occurs in the respiratory zone, which includes respiratory bronchioles, alveolar ducts, and alveolar sacs.

In Which Structure Does Diffusion of Oxygen to Capillaries Not