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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

The advantages of polycythemia begin to be offset by the increased blood viscosity when the hematocrit reaches about

A. 30-40 percent

B. 40-50 percent

C. 55-60 percent

D. 60-70 percent

Summary Introduction

Introduction:

The abnormal rise in RBC (red blood cell) in the body is called polycythemia. It is a state in which the volume of the hematocrit is increased in the blood. It maintains the low level of oxygen in blood by increasing the oxygen carrying capacity of blood.

Explanation

Explanation for the correct answer:

Option (c) is given as 55–60%. The normal male hematocrit level is about 45%. The high level of RBCs makes the blood thick. The increase in the oxygen-carrying capacity during polycythemia is balanced when the viscosity of the blood is increased. This happens when the hematocrit level reaches around 55–60%. Hence, option (c) is correct.

Explanation for incorrect answer:

Option (a) is given as 30–40%. It is incorrect because the normal value of hematocrit is around 45% in a healthy human. Polycythemia occurs due to the elevated hematocrit levels, which is balanced by the viscosity of the blood when hematocrit reaches 55–60%...

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