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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

Solutions

Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

The peripheral chemoreceptors are significantly activated when the P O 2 decreases to about

A. 75 mm Hg

B. 70 mm Hg

C. 65 mm Hg

D. 60 mm Hg

Summary Introduction

Introduction:

Peripheral chemoreceptors are present throughout the body and send an impulse to the respiratory centers, which facilitate the activation of specific ventilatory patterns. They are oxygen sensitive cells that respond to the decreased levels of oxygen in the arterial blood. They are located at the bifurcation of the external and internal carotid arteries.

Explanation

Justification for the correct answer:

Option (D) is, ‘60 mmHg.’ This option is correct, as the peripheral chemoreceptors get activated only when the inspired air is low enough to reduce the partial pressure of oxygen to 60 mmHg. It is 90% of the SaO2 (oxygen saturation). Hence, option (D) is the correct answer.

Justification for the incorrect answers:

Option (A) is, ‘75 mmHg.’ It is false, as the pressure is very high and cannot activate the peripheral chemoreceptors...

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