alleryStart learning →What do the two ends of the laryngotracheal bud become?
AThe larynx proximally and alveoli distally
BThe pharynx proximally and larynx distally
CThe trachea proximally and alveoli distally
DThe trachea proximally and bronchial buds distally
Answer & Solution
Correct answer: D. The trachea proximally and bronchial buds distally
1. The laryngotracheal bud forms as the lung bud extends longitudinally.
2. The portion nearest the pharynx becomes the trachea.
3. The distal end becomes more bulbous and forms the bronchial buds.
4. Those buds eventually become the bronchi and all other lower respiratory structures, so alveoli are several steps further on than the options suggest.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.7 Embryonic Development of the Respiratory System_
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