Principles of Anatomy and Physiology

16th Edition

ISBN: 9781119662792

Author: Tortora, Gerard J., DERRICKSON, Bryan H.

Publisher: WILEY

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Textbook Question

Chapter 20, Problem 15CP

Why must left ventricular pressure be greater than aortic pressure during ventricular ejection?

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Chapter 20, Problem 14CP

Chapter 20, Problem 16CP

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Why is ventricular fibrillation such a serious arrhythmia?

Why do the coronary arteries carry a greater blood flow during ventricular relaxation than they do during ventricular contraction?

What anatomical feature prevents the electrical signal from traveling directly from atrial muscle to ventricular muscle?

Chapter 20 Solutions

Principles of Anatomy and Physiology

Ch. 20 - l. Define each of the following external features...Ch. 20 - 2. Describe the structure of the pericardium and...Ch. 20 - 3. What are the characteristic internal features...Ch. 20 - Prob. 4CP Ch. 20 - 5. What is the relationship between wall thickness...Ch. 20 - Prob. 6CP Ch. 20 - What causes the heart valves to open and to close?...Ch. 20 - In correct sequence, which heart chambers, heart...Ch. 20 - Prob. 9CP Ch. 20 - Prob. 10CP

Ch. 20 - 11. In what ways are autorhythmic fibers similar...Ch. 20 - What happens during each of the three phases of an...Ch. 20 - 13. In what ways are ECGs helpful in diagnosing...Ch. 20 - How does each ECG wave, interval, and segment...Ch. 20 - 15. Why must left ventricular pressure be greater...Ch. 20 - Prob. 16CP Ch. 20 - During which two periods of the cardiac cycle do...Ch. 20 - Prob. 18CP Ch. 20 - Prob. 19CP Ch. 20 - Prob. 20CP Ch. 20 - Prob. 21CP Ch. 20 - Define cardiac reserve. How does it change with...Ch. 20 - Prob. 23CP Ch. 20 - 24. What are some of the cardiovascular benefits...Ch. 20 - Prob. 25CP Ch. 20 - Prob. 26CP Ch. 20 - Why is the cardiovascular system one of the first...Ch. 20 - From which tissue does the heart develop?Ch. 20 - Gerald recently visited the dentist. During the...Ch. 20 - 2. Unathletic Sylvia resolves to begin an exercise...Ch. 20 - 3. Mr. Perkins is a large, 62-year-old man with a...

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Which part of the intrinsic conduction system directly excites ventricular myocardial cells? In which direction does the depolarization wave travel across the ventricles?
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