The airways most responsible for the resistance of the respiratory system (R_aw)during mouth breathing are: A)The trachea,main stem,and lobar bronchi. B)The terminal bronchioles. C)The respiratory bronchioles. D)The alveoli and alveolar ducts.

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The trachea, main stem bronchi, and lobar bronchi have larger diameters and therefore offer less resistance to airflow compared to smaller airways such as the terminal bronchioles, respiratory bronchioles, alveoli, and alveolar ducts. This means that during mouth breathing where airflow is unimpeded by nasal structures, the larger airways are the most responsible for the resistance of the respiratory system.

The Airways Most Responsible for the Resistance of the Respiratory