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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

Solutions

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Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

Which of the following slows the heart rate and AV conduction?

A. Resting membrane potential

B. Parasympathetic nervous system

C. Pacemaker

D. Phase 0

Summary Introduction

Introduction:

The conductive system of the heart is comprised of Purkinje fibers, left and right bundle branches, bundle of His, atrioventricular junction, and sinoatrial node. Sinoatrial node or pacemaker initiates the electrical cycle of the heart. The cardiac contractions are initiated by the sinoatrial node. The conductive system has its own pacemaker; however, the autonomic nervous system plays a significant role in the regulation of the heart rate.

Explanation

Justification for the correct answer:

Option (b) is, ‘parasympathetic nervous system.’ The parasympathetic neural fibers innervate the atrioventricular junction, atrial muscle fibers, and sinoatrial fibers. It has a less influence on the ventricular musculature, however, the stimulation brings about a decrease in the excitability, contractility, AV conduction, and heart rate. Hence, option (b) is correct.

Justification for the incorrect answers:

Option (a) is, ‘resting membrane potential.’ The resting membrane potential is the electrical difference between the electrolytes inside and outside of the membrane at the resting stage...

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