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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

Ninety-five percent of the alveolar surface is composed of which of the following?

1. Type I cells

2. Granular pneumocytes

3. Type II cells

4. Squamous pneumocytes

A. 1 only

B. 2 only

C. 2 and 3 only

D. 1 and 4 only

Summary Introduction

Introduction:

The respiratory system is one of the vital biological systems, segregated into the upper and lower respiratory system. In the lower respiratory system, the structures distal to the terminal bronchioles are known to be the functional segments of gas exchange.

Explanation

Explanation for the correct answer:

Option (d) is given as 1 and 4 only. Type I cells are also called squamous pneumocytes. These are mainly composed of the cytoplasmic ground material and are known to be broad, thin cells which make around 95% of the alveolar surface. These cells are 0.1 to 0.5 nanometre thick and are called major sites of alveolar gas exchange. Hence, option (d) is the correct answer.

Explanation for the incorrect answer:

Option (a) is given as 1 only...

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