Which of the following is considered physiologic dead space?
a. Respiratory bronchiole and unperfused alveoli
b. Trachea and perfused alveoli
c. Trachea and unperfused alveoli
d. Trachea and mainstem bronchi
C
Respiratory bronchioles participate in gas exchange. The areas in the lungs that are ventilated but in which no gas exchange occurs are known as dead space regions (trachea and mainstem bronchi). These unperfused alveoli are known as alveolar dead space. Anatomic dead space plus alveolar dead space is called physiologic dead space.
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