When thinking in terms of airway radius with regard to resistance, the lung structure responsible for the most airway resistance to airflow would be:
A) The entire length of trachea
B) The right bronchus at the bifurcation
C) The bronchioles near the trachea
D) A single alveolus
Ans: C
Feedback:
The primary determinant of airway resistance to airflow is the radius of the conducting airway. Therefore, the site of most of the resistance occurs in the larger bronchioles and bronchi near the trachea, with the smallest airways contributing very little to the total airway resistance. However, although the resistance of each individual bronchiole may be relatively high, their great number results in a large total cross-sectional area, causing their total combined airway resistance to be low.
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