Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

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

Under normal resting conditions, the diffusion of oxygen and carbon dioxide is usually completed in about

1. 0.25 second

2. 0.50 second

3. 0.75 second

4. 1.0 second

5. one-third of the time available:

A. 2 only

B. 3 only

C. 4 and 5 only

D. 1 and 5 only

Summary Introduction


The exchange of gases is performed in the alveolar space and capillaries. The deoxygenated blood in the capillaries, carrying carbon dioxide, is oxygenated with the oxygen carried into the alveolar space. This exchange of gases takes place during the transit time of the blood through the alveolar-capillary system.


Justification/ Explanation for the correct answer:

Option (D) is 0.25 seconds. When blood enters the alveolar-capillary system the gaseous exchange is facilitated by the difference between the pressure gradient of the two gases. The pressure gradient of oxygen is 60 mm Hg and that of carbon dioxide is 6 mm of Hg. This facilitates the diffusion of two gases. This diffusion takes place in one-third of the transit time available. In resting or normal conditions, the transit time is 0.75 seconds. This makes the time for exchange of gases as 0.25 seconds. Hence, option (D) is correct.

Explanation for the incorrect answers:

Option (A) is 2 only, that is, 0.50 seconds. This time is double the actual value. The exchange of gases takes one-third of transit time...

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

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

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

Solid fats and high-calorie choices lurk in every food group. T F

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

Describe how protons and neutrons were discovered to be constituents of nuclei.

General Chemistry - Standalone book (MindTap Course List)

_______ are organelles involved in gravitropism.

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