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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

An electrical difference across the fibers of the heart is called the

A. Absolute refractory period

B. Resting membrane potential

C. Action potential

D. Depolarization

Summary Introduction

Introduction:

The heart is comprised of two types of cells, namely the autorhythmic cells and the contractile muscle fibers. The autorhythmic cells are also referred to as the pacemaker cells and are located in the sinoatrial node. The bulk of the myocardium is comprised of the contractile muscle fibers. The autorhythmic cells have the ability to start an action potential.

Explanation

Justification for the correct answer:

Option (b) is, ‘resting membrane potential.’ Resting membrane potential can be defined as the electrical difference across the heart cell fibers. It is the electrical difference in the polarized or the resting state. Hence, option (b) is correct.

Justification for the incorrect answers:

Option (a) is, ‘absolute refractory period.’ Absolute refractory period is the duration during which the cells are not able to respond to any stimulus...

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