Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

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

When shunted, non-reoxygenated blood mixes with reoxygenated blood distal to the alveoli (venous admixture), the

1. P o 2 of the non-oxygenated blood increases

2. CaO2 of the reoxygenated blood decreases

3. P o 2 of the reoxygenated blood increases

4. Ca o 2 of the non-oxygenated blood decreases

A. 1 only

B. 4 only

C. 1 and 2 only

D. 3 and 4 only

Summary Introduction


Pulmonary shunting is a condition in which alveoli are perfused with the normal amount of blood but the oxygen does not reach the alveoli of the lungs, and hence, enough ventilation do not occur. This means the ventilation to perfusion ratio is zero. Pulmonary shunting could be due to absolute shunts (anatomical) or pathological shunts (congenital defects, pulmonary oedema etc.). This leads to venous admixture i.e. non-oxygenated blood gets shunted distal to alveoli and mixes with the oxygenated blood.


Justification/Explanation for correct answer:

When venous admixture occurs, the process continues until all the mixed non-oxygenated and reoxygenated blood has the same PO2 throughout the plasma with hemoglobin having the same number of oxygen molecules. So, the non-oxygenated blood has an increased oxygen content and an increased partial pressure of oxygen and the reoxygenated blood has a decreased oxygen content and partial pressure. Hence, option (c) is the correct answer.

Explanation for incorrect answer:

Non-oxygenated blood gets mixed with oxygenated blood, distal to alveoli. Oxygenated blood is rich in oxygen. So, the oxygen moves from oxygenated blood to non-reoxygenated blood, and PO2 of non-oxygenated blood increases. But option (a) only has 1, which isn’t the only correct option...

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

Protein digestion begins in the mouth. stomach. small intestine. large intestine.

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

Why does helium fusion require a higher temperature than hydrogen fusion?

Horizons: Exploring the Universe (MindTap Course List)

Anticodons pair with ___ . a. mRNA codons b. DNA codons c. RNA anticodons d. amino acids

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