EBK HUMAN ANATOMY
9th Edition
ISBN: 9780134424828
Author: Nath
Publisher: YUZU
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Question
Chapter 21, Problem 10RC
Summary Introduction
To review:
The function of the SA (sinoatrial) node and the difference in its function from the AV (atrioventricular) node.
Introduction:
The SA node of the heart is the natural pacemaker. It sends out electrical impulses from the atrium, which results in its contraction. The contraction of the atrium then leads to the pumping of the blood to the lower chamber of the heart, that is, the ventricle. The AV node has the smaller cells that conduct these impulses to the ventricle via a junction box.
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What anatomic features slow the conduction rate of the action potential as it passes through the AV node? What is the function of this delay?
Describe the function of the SA and AV nodes as they control contraction of the heart.
What is the importance and the physiology of the cardiac conduction system?
Chapter 21 Solutions
EBK HUMAN ANATOMY
Ch. 21 - Match each numbered item with the most closely...Ch. 21 - Prob. 2RFTCh. 21 - Prob. 3RFTCh. 21 - Prob. 4RFTCh. 21 - Prob. 5RFTCh. 21 - Match each numbered item with the most closely...Ch. 21 - Prob. 7RFTCh. 21 - Prob. 8RFTCh. 21 - Prob. 9RFTCh. 21 - Match each numbered item with the most closely...
Ch. 21 - The potential space between the parietal and...Ch. 21 - Prob. 12RFTCh. 21 - Which of the following is not true of intercalated...Ch. 21 - Prob. 14RFTCh. 21 - The pacemaker cells of the heart are located in...Ch. 21 - Prob. 16RFTCh. 21 - Prob. 1RCCh. 21 - If the papillary muscles fail to contract, (a)...Ch. 21 - Prob. 3RCCh. 21 - Prob. 4RCCh. 21 - Prob. 5RCCh. 21 - Define a pacemaker cell, and list the group of...Ch. 21 - Prob. 7RCCh. 21 - Prob. 8RCCh. 21 - Why are nodal cells unique? What is their...Ch. 21 - Prob. 10RCCh. 21 - Prob. 1CTCh. 21 - 2. Lee is brought to the emergency room suffering...Ch. 21 - Prob. 3CT
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- how does the delay of the impulse at the atrioventricular node contrribute to cardiac function?arrow_forwardDescribe the pathway of electrical conduction of the heart, starting with the SA node. How does damage to the AV node affect this conduction pathway and the ECG?arrow_forwardPressure changes that occur during the cardiac cycle are responsible for what two physiologic processes within the heart?arrow_forward
- Describe the sequence of the cardiac conduction system.arrow_forwardExplain the pathway of the conductions system in the Heart?arrow_forwardDescribe the mechanical events of the cardiac cycle. (use terms like atrial systole, atrial diastole, ventricular diastole, ventricular systole, isovolumic ventricular contraction, isovolumic ventricular relaxation, ventricular ejection, period of rapid filling)arrow_forward
- Diagram electrical conduction of the heart and discuss each component (SA node, AV node, etc). How does this dictate the fluidity of heart contraction? Why does the SA always start the conduction? What is the inherent rate of depolarization of the SA node (this means that if the nervous system was shut off what would resting bpm be)? If it is damaged what happens to the electrical conduction system?arrow_forwardFigure shows the conduction system of the heart that transmit the electrical impulses for the coordination of cardiac cycle. a) Referring to the Figure , which part of the heart's electrical conduction is known as the “pacemaker” of the heart? b)Explain how D controls atria and ventricles which causes ventricular systole.arrow_forwardWhich chamber has higher pressure during the following phases of the cardiac cycle? a) ventricular ejection, b) isovolumic ventricular relaxation, c) atrial and ventricular diastole, d) isovolumic ventricular contraction. Why?arrow_forward
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