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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

Case 1

During fetal development, the alveolarcapillary system and the quantity of pulmonary surfactant usually are not sufficient to support life until the _____ week of gestation.

Summary Introduction

To review:

The blank space in the statement, “During fetal development, the alveolar-capillary system and the quantity of pulmonary surfactant usually are not sufficient to support life until the _________ week of gestation.”

Introduction:

The lung development in a fetus takes place in five different phases, namely, embryonic, pseudoglandular, canalicular, terminal saccular, and the alveolar period. Initially, the lungs appear as a bud and grow from the primitive esophagus. The appearance of lungs in fetus takes place after 26 days of conception. The development of the respiratory system takes place in stages.

Please refer to Clinical Application Case-1 for further information.

Explanation

The developmental events taking place between the 17th and 26th week of pregnancy are included in the canalicular period. The proliferation of the terminal bronchioles continues during this period. During this period, the primitive terminal bronchioles, terminal saccules, and respiratory bronchioles begin to appear. This forms the foundation of gaseous exchange...

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