Which of the following is not true of the respiratory tract from the medium bronchi to the aveoli?
a. lining of the tubes changes from ciliated columnar to simple squamous epithelium in the alveoli.
b. proportionally, smooth muscle decreases uniformly.
c. resistance to air flow increases due to the increase in cross-sectional diameter
d. cartilage gradually decreases and disappears at the bronchioles.

C) Resistance to air flow increases due to the increase in cross-sectional diameter

Explanation:

As, resistance to air flow increased due to the increased in cross sectional diameter is not true because resistance offer by an individual alveolus is more than that it offered by the medium size bronchi but the number of alveoli is much more as compared. In fact that the maximum resistance to airflow is encountered in the medium sized bronchi.

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answer:

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explanation:

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