Question

Bronchi branch into the tubes of smaller diameters (less than 1 mm) known as ______.

• A. Eustachian tubes
• B. alveoli
• C. bronchioles
• D. alveolar sacs

Answer 1

The correct option is C

bronchioles

The bronchioles or bronchioli are the passageways by which air passes through the nose or mouth to the alveoli (air sacs) of the lungs, in which branches no longer contain cartilage or glands in their submucosa. They are branches of the bronchi, and are part of the conducting zone of the respiratory system.