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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

The cardioinhibitor center of the medulla slows the heart by sending neural impulses by way of the

1. Tenth cranial nerve

2. Parasympathetic nervous system

3. Sympathetic nervous system

4. Vagus nerve

A. 4 only

B. 3 only

C. 1 and 4 only

D. 1,2, and 4 only

Summary Introduction

Introduction:

The central nervous system (CNS) controls the functions of the heart. The autonomic nervous system (ANS) is the control system that unconsciously regulates functions such as heart rate, respiratory rate, digestion, and pupillary constriction/relaxation. The neurons from the medulla that innervate through the autonomic nervous system regulate the impulses of the heart. Medulla, therefore, has a cardio-acceleratory portion and a cardio-inhibitory portion.

Explanation

Justification/explanation for the correct answer:

Option (d) states that the vagus nerve and parasympathetic nervous system are part of the cardio-inhibitory center of the medulla and slow down the heartbeat. The autonomic nervous system controls the heartbeat. The parasympathetic nervous system is one of the three divisions of the ANS through which the inhibitory effect of the heart takes place with the help of the vagus nerve (tenth cranial nerve). It has both afferent and efferent fibers. The afferent fibers run from the heart to the cardio-inhibitory center in the medulla and the efferent fibers run from the medulla to the heart to decrease the heart rate. Hence, option (d) is correct.

Explanation for the incorrect answers:

Option (a) sates that the vagus nerve, which is a part of the cardio-inhibitory center of the medulla, slows down the heartbeat...

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