BuyFind

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
Publisher: Cengage Learning,
ISBN: 9781337794909
BuyFind

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
Publisher: Cengage Learning,
ISBN: 9781337794909

Solutions

Chapter
Section
Chapter 10, Problem 2RQ
Textbook Problem

The lungs are usually sufficiently mature to support life by the

A. 24th week of gestation

B. 28th week of gestation

C. 32nd week of gestation

D. 36th week of gestation

Expert Solution
Summary Introduction

Introduction:

Reproduction is one of the basic functions among all living organisms. The process varies from simple cellular division in case of unicellular bacteria to the very complex process of development of organs in higher animals. Development of the lungs takes a special place in the development of the fetus. Development of the lungs takes place in five phases. They are:

Embryonic phase

Pseudoglandular phase

Canalicular phase

Terminal saccular phase

Alveolar phase

Explanation of Solution

Explanation for the correct answer:

Option (B) is 28th week of gestation. At about 28 weeks of gestation, the air blood interface develops to an extent that it can support life. The terminal saccules transform into alveoli. The alveolar cells differentiate into Type I and II cells, with the Type II cells increasing the production of pulmonary surfactant. Hence, option (B) is the correct answer

Explanation for the incorrect answer:

Option (A) is 24th week of gestation. The respiratory bronchioles continue to develop. Terminal saccules also start to appear, which forms the first step in the process of gas exchange. Traces of pulmonary surfactant can also be seen at this stage called the canalicular phase...

Want to see this answer and more?

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

See solution

Additional Science Textbook Solutions

Find more solutions based on key concepts
Show solutions
What behaviors would be most helpful in preventing osteoporosis?

Understanding Nutrition (MindTap Course List)

Added sugars can be useful in meeting the high carbohydrate needs of some athletes. T F

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

25-47 What is the purpose of piRNA?

Introduction to General, Organic and Biochemistry

A testcross is a way to determine ________. a. phenotype b. genotype c. dominance

Biology: The Unity and Diversity of Life (MindTap Course List)

What gives amino acids their individual properties?

Biology: The Dynamic Science (MindTap Course List)

A rod of length 30.0 cm has linear density (mass per length) given by =50.0+20.0x where x is the distance from ...

Physics for Scientists and Engineers, Technology Update (No access codes included)

How do hydrogenous materials form? Give an example of hydrogenous sediment.

Oceanography: An Invitation To Marine Science, Loose-leaf Versin