Campbell Biology in Focus; Modified Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780134433776
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman
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; Modified Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology in Focus (2nd 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 are the difference between contractile cells of the heart and electrical cells responsible for generation and conduction of impulses. Why is the cardiac action potential propagated more slowly in an AV node cell than in an atrial or ventricular myocyte? How are the channels and ions that are responsible for depolarization and repolarization work? How can be AV conduction affected by hypokalemia?arrow_forwardWhat pressure difference between the ventricle and the atrium causes theatrioventricular valve to close?arrow_forward
- The left AV valve has only two large leaflets, while the right AV valve has three smaller leaflets. It is a general principle of physiology that structure is a determinant of—and has coevolved with—function. Although it is unknown why the two valves differ in structure in this way, what difference in the functional demands of the left side of the heart might explain why there is one less valve leaflet than on the right side?arrow_forwardWhy is the Sino-atrial node called the pacemaker of the heart?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_forwardWhat is occurring during ventricular ejection ? The AV valves are closed and the semilunar valves are open as blood is leaving the ventricles . The AV valves are open and the semilunar valves are closed as ventricular pressure is . increasing The AV valves are open and the semilunar valves are closed as blood is leaving the ventricles . The AV and semilunar valves are closed as ventricular pressure is increasing .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_forward
- Which part of the intrinsic conduction system directly excites ventricular myocardial cells? In which direction does the depolarization wave travel across the ventricles?arrow_forwardHow would heart function be affected if the AV valves did not completely close during ventricular contraction?arrow_forwardWhat role does the AV nodal delay play in normal cardiac function?arrow_forward
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