Which of the following describes an acinus?

a. Each acinus is comprised of five terminal respiratory units.
b. It consists of all structures distal to a ter-minal bronchiole.
c. It is composed of the smaller conducting airways.
d. It is the transitional portion of the lung between conduction and respiration.


ANS: B
A single terminal bronchiole supplies a cluster of respiratory bronchioles. Collectively, this unit is referred to as the acinus.

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