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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

Which of the following has the greatest combined cross-sectional area?

A. Terminal bronchioles

B. Labar bronchi

C. Trachea

D. Segmental bronchi

Summary Introduction

Introduction:

The respiratory system is one of the vital biological systems, which is segregated into the upper and lower respiratory systems. In the lower respiratory system, trachea, bronchi, bronchioles, and alveoli are mainly involved in the gas exchange process.

Explanation

Explanation for the correct answer:

Option (a) is terminal bronchioles. These are the conducting tubes of the tracheobronchial tree along with the terminal bronchioles found between the 16th and 19th generations. The average diameter is around 0.5 mm. As the terminal bronchioles progress, the walls become thinner, tiny channels called canals of Lambert start to appear between the inner luminal region of the terminal bronchioles and the neighboring alveoli. Hence, option (a) is the correct answer.

Explanation for the incorrect answers:

Option (b) is lobar bronchi...

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