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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

Which of the following is the plateau stage of the action potential?

A. Phase 0

B. Phase 1

C. Phase 2

D. Phase 3

Summary Introduction

Introduction:

Action potentials are the electrical currents that travel across the membrane of the cells of the heart. The heart generates and propagates the action potential for the contraction. The action potential of the cells of the heart is similar to the neurons, cardiac muscles, and skeletal muscles. Resting membrane potential is the electrical difference between the outer and inner membranes during the resting or polarized state.

Explanation

Justification for the correct answer:

Option (c) is, ‘Phase 2.’ Phase 2 is the plateau stage that is marked by the slowing down of the inward flow of calcium ions and the outward flow of potassium ions. It helps in the elongation of the contraction. Hence, option (c) is correct.

Justification for the incorrect answers:

Option (a) is, ‘Phase 0.’ This is false as this phase is associated with the rapid depolarization of the ventricular muscles. So, it is an incorrect option.

Option (b) is, ‘Phase 1...

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