Select the correct statement from the following.

Moderate

A

Alveoli are the only structures of exchange zone of the respiratory system
B

The terminal bronchioles represent the end of the conducting zone of the respiratory system
C

Any change in the volume of the pulmonary cavity will be reflected in the thoracic cavity
D

The air in the alveolar ducts is termed anatomic dead space

Solution

The conducting zone extends from the external nostrils up to the terminal bronchioles. Respiratory bronchioles, alveolar ducts, alveolar sacs and alveoli represent the exchange zone. Any change in the volume of the thoracic cavity will be reflected in the pulmonary cavity; we cannot directly alter the lung volume. Anatomic dead space refers to the air in the conducting zone. Alveolar ducts are a part of exchange zone.

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