Which of the following is the smallest active functional unit - ProProfs Discuss
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Which of the following is the smallest active functional unit (including conduction and air exchange) of the lung?



A. An alveolus
B. A respiratory bronchiolar unit
C. A bronchopulmonary segment
D. Segmental bronchi
E. An intrapulmonary bronchus
Asked by Hiltonr, Last updated: Jan 26, 2020

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USMLE step 1 Qs (5)

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2 Answers

E. Good

E. Good

Answered Jan 17, 2019

You have to remember that all of the parts of the body have their own functions. Some of them will not make it possible for humans to survive. There are others that human beings can live without but would need to make some drastic changes to address the change. When it comes to the lung, the smallest active functional unit has to be letter B. This contains the alveoli and the bronchiole. Take note that the alveolus can be associated with the exchange. Letter C may seem like the best a...Read More
 

John Smith

John Smith

Answered Sep 08, 2016

A respiratory bronchiolar unit -the smallest functional unit of the lung is the respiratory bronchiolar unit, which contains a respiratory bronchiole and the alveoli associated with it. this unit allows for air conduction and gas exchange. the alveolus is only associated with gas exchange, and the bronchi form part of the conduction system. the bronchopulmonary segment is a functional unit of lung structure, but it is not the smallest unit. bronchopulmonary segments are particularly important...Read More
 

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