Chapter 6, Problem 10RQ

### Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

Chapter
Section

### Cardiopulmonary Anatomy & Physiolo...

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

# Under normal conditions, the O 2 ER is aboutA. 10 percentB. 15 percentC. 20 percentD. 25 percent

Summary Introduction

Introduction:

Oxygen extraction ratio (O2ER) is the ratio of the oxygen extracted from the peripheral tissues to the transferred amount of oxygen to these same peripheral tissues. This ratio dictates the utilization of oxygen, so it is also known as the oxygen utilization ratio or oxygen coefficient ratio. This ratio tells about the oxygen content and its transport status in our body.

Explanation

Option (d) is, ‘25 percent.’ To calculate O2ER, the oxygen content of the arterial blood (CaO2) and the arterial-venous oxygen content difference [C(a-v)O2] must be known. Oxygen content in ml (milliliter) per 100 ml of the arterial blood (CaO2) is around 20 mL/dL (milliliter per deciliter) and the oxygen content in the venous blood (CvO2) is around 15mL/dL, which is computed from the mixed blood in the pulmonary artery. Thus,

C(a-v)O2=CaO2CvO2C(a-v)O2=2015 mL/dL C(a-v)O2 =5 mL/dL

Now,

O2ER=

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