Which structure opens into the alveolar sac?

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Question

(D) The respiratory system in humans consists of a branching network of tubes. Air enters through the trachea,which divides into primary,secondary,and

Vedclass · Accepted Answer

None of the above

Vedclass · Answer

(D) The respiratory system in humans consists of a branching network of tubes. Air enters through the trachea,which divides into primary,secondary,and tertiary bronchi. These bronchi further divide into bronchioles. The terminal bronchioles give rise to respiratory bronchioles,which then lead to alveolar ducts. These alveolar ducts finally open into the alveolar sacs (or alveoli). Since none of the options $A$,$B$,or $C$ represent the structure that directly opens into the alveolar sac (which is the alveolar duct),the correct answer is $D$.

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