Which of the following is not true of the respiratory tract from the medium bronchi to the aveoli?
A. Cartilage gradually decreases and disappears at the bronchioles.
B. Resistance to air flow increases due to the increase in cross-sectional diameter.
C. Proportionally, smooth muscle decreases uniformly.
D. Lining of the tubes changes from ciliated columnar to simple squamous epithelium in the alveoli.
Answer:B
Which of the following is not true of the respiratory tract from the medium bronchi to the aveoli?
A. Cartilage gradually decreases and disappears at the bronchioles. B. Resistance to air flow increases due to the increase in cross-sectional diameter. C. Proportionally, smooth muscle decreases uniformly. D. Lining of the tubes changes from ciliated columnar to simple squamous epithelium in the alveoli.