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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

When does the inward flow of Ca 2 + into the heart stop?

A. Phase 1

B. Phase 2

C. Phase 3

D. Phase 4

Summary Introduction

Introduction:

The contraction of the heart is based on the generation and propagation of the action potential. It can be defined as the electric current that travels across the cell membranes. When the heart is in a relaxed state, it is referred to as a resting state or polarized state. This period is marked by the electrical difference across the membrane. This difference is referred to as the resting membrane potential.

Explanation

Justification for the correct answer:

Option (c) is, ‘Phase 3.’ The inward flow of the calcium ions stops during phase 3. There occurs an increase in the outward flow of potassium ions. This causes an increase in the rate of repolarization. Hence, option (c) is correct.

Justification for the incorrect answers:

Option (a) is, ‘Phase 1.’ Phase 1 is associated with the repolarization of the membrane. The potassium ion channels get opened just after phase 0, which allows the inflow of potassium ions...

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