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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 entire sequence of electrical changes during depolarization and repolarization is called

A. Nonrefractory period

B. Conductivity

C. Contractility

D. Action potential

Summary Introduction

Introduction:

The resting state or the polarized state is the state during which the heart is relaxed and is not generating an action potential. Depolarization of the heart muscles refers to the rapid inward flow of the sodium ions through sodium ion channels. Repolarization is the process through which the cardiac cells return to the resting state.

Explanation

Justification for the correct answer:

Option (d) is, ‘action potential.’ Action potentials are the electrical currents that travel across the membranes of the cardiac cells. The action potential is the sequence of electrical changes during repolarization and depolarization. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is, ‘nonrefractory period.’ The nonrefractory period occurs when all the cardiac cells are in the resting state...

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