Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
3rd Edition
ISBN: 9780134895727
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Publisher: PEARSON
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Textbook Question
Chapter 34.2, Problem 2CC
Why is it important that the AV node delay the electrical impulse moving from the SA node and the atria to the ventricles?
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Why is it important for impulses from the atria to be delayed at the AV node before they pass into the ventricles?
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?
Why is it important that the AV node delay the electricalimpulse moving from the SA node and the atria to theventricles?
Chapter 34 Solutions
Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
Ch. 34.1 - How is the now of hemolymph through an open...Ch. 34.1 - Three-chambered hearts with incomplete septa were...Ch. 34.1 - Prob. 3CCCh. 34.2 - Prob. 1CCCh. 34.2 - Why is it important that the AV node delay the...Ch. 34.2 - Prob. 3CCCh. 34.3 - What is the primary cause of the low velocity of...Ch. 34.3 - Prob. 2CCCh. 34.3 - Prob. 3CCCh. 34.4 - Prob. 1CC
Ch. 34.4 - Prob. 2CCCh. 34.4 - Prob. 3CCCh. 34.4 - Prob. 4CCCh. 34.5 - Why is an internal location for gas exchange...Ch. 34.5 - After a heavy rain, earthworms come to the...Ch. 34.5 - MAKE CONNECTIONS Describe similarities in the...Ch. 34.6 - Prob. 1CCCh. 34.6 - Prob. 2CCCh. 34.6 - WHAT IF? If an injury tore a small hole in the...Ch. 34.7 - What determines whether O2, or CO2, undergoes net...Ch. 34.7 - How does the Bohr shift help deliver O2, to very...Ch. 34.7 - Prob. 3CCCh. 34 - Which of the following respiratory systems is not...Ch. 34 - Blood returning to the mammalian heart in a...Ch. 34 - Pulse is a direct measure of A. blood pressure. B....Ch. 34 - Prob. 4TYUCh. 34 - One feature that amphibians and humans have in...Ch. 34 - If a molecule of CO2 released into the blood in...Ch. 34 - Prob. 7TYUCh. 34 - DRAW IT Plot blood pressure against time for one...Ch. 34 - Prob. 9TYUCh. 34 - Prob. 10TYUCh. 34 - Prob. 11TYUCh. 34 - SYNTHESIZE YOUR KNOWLEDGE The diving bell spider...
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- After the AV node depolarizes , the next event directly following is A) AV bundle depolarization C) Ventricular systole D) Purkinje fiber depolarizationarrow_forwardWhat pressure difference between the ventricle and the atrium causes theatrioventricular valve to close?arrow_forwardWhat is the inherent rate of automaticity at the AV junction?arrow_forward
- As blood in the ventricles surges back against the closed AV valves, the first heart sound ("lubb") can be heard. Why does this heart sound occur near the middle of the QRS complex in the ECG?arrow_forwardWhich component of the conducting system is located in thefloor of the right atrium, between the right AV valve and thecoronary sinus opening?arrow_forwardWhich part of the intrinsic conduction system directly excites ventricular myocardial cells? In which direction does the depolarization wave travel across the ventricles?arrow_forward
- Why do the coronary arteries carry a greater blood flow during ventricular relaxation than they do during ventricular contraction?arrow_forwardWhat anatomical feature prevents the electrical signal from traveling directly from atrial muscle to ventricular muscle?arrow_forwardWhy is the thickness of the myocardium different in the right and left ventricles?arrow_forward
- As blood in the ventricles surges back against the closed AV valves, the first heart sound lubb can be heard.Why does this heart sound occur near the middle of the QRS complex in an ECG?arrow_forwardWhy is the cardiac action potential propagated more slowly in an AV node cell then in an atrial or ventricular myocyte?arrow_forwardDuring isovolumetric ventricular contraction: a) all valves are open and pressure within the ventricles decreases. b) all valves are open and pressure within the ventricles increases. c) all valves are closed and pressure within the ventricles decreases. d) all valves are closed and pressure within the ventricles increases.arrow_forward
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