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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

Which of the following is called the resting state?

A. Phase 1

B. Phase 2

C. Phase 3

D. Phase 4

Summary Introduction

Introduction:

Action potentials are the electric currents that travel across the membrane of the cells of the heart. Action potentials are generated and propagated by the heart for its contraction. The electrical events are identical to the neurons, cardiac muscles, and skeletal muscles. There are five different phases of the action potential. It includes depolarization and repolarization.

Explanation

Justification for the correct answer:

Option (d) is, ‘Phase 4.’ The voltage sensitive ion channels are returned to the pre-depolarization permeability during phase 4. The excess of calcium ions are removed by sodium and calcium ion channels. This is the reason why this phase is known as the resting or polarized state. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is, ‘Phase 1.’ Phase 1 is also known as initial repolarization. During this phase, the potassium ions flow out of the cells...

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