   Chapter 6, Problem 10RQ

Chapter
Section
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

Justification/Explanation for the correct answer:

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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