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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

When can a strong stimulus cause an unwanted depolarization of the heart?

A. Absolute refractory period

B. Relative refractory period

C. Nonrefractory period

D. Phase 0

Summary Introduction

Introduction:

There are four specific properties of the cardiac cells, namely automaticity, contractibility, conductivity, and excitability. Apart from these properties, another important property is refractory periods. The refractory period includes the ionic composition of cells and the ability of the cells to accept a stimulus. There are three different types of the refractory period, namely absolute refractory period, nonrefractory period, and relative refractory period.

Explanation

Justification for the correct answer:

Option (b) is, ‘relative refractory period.’ It is the time during which the repolarization of the membrane is almost done and a strong stimulus is able to generate the depolarization of some of the cells. There is a mixed response of the cells to a strong stimulus during this period. Hence, option (b) is correct.

Justification for the incorrect answers:

Option (a) is, ‘absolute refractory period.’ It is the time in which no cell can respond to the stimulus...

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