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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 sinoatrial node is also called the

A. Pacemaker

B. Action potential

C. Resting membrane potential

D. Relative refractory period

Summary Introduction

Introduction:

Heart is a muscular organ that pumps blood throughout the blood vessels. It helps in providing oxygen and nutrients and removes carbon dioxide and other metabolic wastes from the tissues. The conduction system of the heart is comprised of the atrioventricular node and the sinoatrial node.

Explanation

Justification for the correct answer:

Option (a) is, ‘pacemaker.’ The heart consists of two types of cardiac cells, namely the contractive muscle fibers and the autorhythmic cells. The contractile muscle fibers comprise most of the myocardium and around one percent of the heart is comprised of the autorhythmic cells. These cells are also known as the pacemaker cells and are located in the sinoatrial node. Hence, option (a) is correct.

Justification for the incorrect answers:

Option (b) is, ‘action potential.’ The action potentials are the electrical currents that travel across the cell membranes...

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