Multiple Choice
The muscularis mucosae is a thin layer of smooth muscle immediately deep (external) to the:
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2. Cell Chemistry & Cell Components
Introduction to Eukaryotic Organelles
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Which of the following are the smallest branches of the bronchial tree?
A
Primary bronchi
B
Bronchioles
C
Lobar bronchi
D
Alveolar sacs
Verified step by step guidance1
Understand the structure of the bronchial tree: The bronchial tree is a branching system of airways that starts with the trachea and divides into progressively smaller branches, facilitating the movement of air into the lungs.
Identify the hierarchy of the bronchial tree: The primary bronchi are the largest branches, followed by the lobar bronchi, segmental bronchi, and smaller branches like bronchioles and alveolar sacs.
Define bronchioles: Bronchioles are the smallest airways in the bronchial tree that lack cartilage and are responsible for directing air to the alveolar sacs, where gas exchange occurs.
Compare bronchioles to other options: Primary bronchi, lobar bronchi, and alveolar sacs are larger or serve different functions compared to bronchioles. Bronchioles are the smallest branches before reaching the alveolar sacs.
Conclude that bronchioles are the correct answer based on their size and position in the bronchial tree hierarchy.
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