CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
3rd Edition
ISBN: 9780135191811
Author: Urry
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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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?
After the AV node depolarizes , the next event directly following is
A) AV bundle depolarization
C) Ventricular systole
D) Purkinje fiber depolarization
Chapter 34 Solutions
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
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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- What 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_forwardAs 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_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_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 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_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_forwardWhat role does the AV nodal delay play in normal cardiac function?arrow_forwardIn an EKG reading: | the P wave corresponds to the AV node firing. the QRS complex corresponds to a time when ventricular pressure is greater than atrial pressure. When in sympathetic mode, the AV Bundle will be receiving impulses at a faster rate then when in parasympathetic mode. | The T wave represents the time when the SA node first fires. The P-R interval represents the delay that occurs when the AV Bundle transmits signals to the Purkinje fibers.arrow_forward
- If damage to the AV node slowed down conduction through the heart, what would be observed on an ECG? an inverted T wave a longer PR interval a larger P wave a wider QRS complex a longer P wavearrow_forwardWhy 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_forward
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