Principles of Anatomy and Physiology
15th Edition
ISBN: 9781119329398
Author: Gerard J Tortora, Bryan Derrickson
Publisher: John Wiley & Sons Inc
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Textbook Question
Chapter 20, Problem 11CP
In what ways are autorhythmic fibers similar to and different from contractile fibers?
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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. 4CPCh. 20 - 5. What is the relationship between wall thickness...Ch. 20 - Prob. 6CPCh. 20 - What causes the heart valves to open and to close?...Ch. 20 - In correct sequence, which heart chambers, heart...Ch. 20 - Prob. 9CPCh. 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. 16CPCh. 20 - During which two periods of the cardiac cycle do...Ch. 20 - Prob. 18CPCh. 20 - Prob. 19CPCh. 20 - Prob. 20CPCh. 20 - Prob. 21CPCh. 20 - Define cardiac reserve. How does it change with...Ch. 20 - Prob. 23CPCh. 20 - 24. What are some of the cardiovascular benefits...Ch. 20 - Prob. 25CPCh. 20 - Prob. 26CPCh. 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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- How does excitation–contraction coupling in cardiac muscle resemble that of skeletal muscle? How is it different?arrow_forwardWhat is the significance of the extended refractory period in cardiac muscle?arrow_forwardHow does digitalis result in an increased contractile force of cardiac muscle?arrow_forward
- Why can we say that cardiac muscle contraction is graded?arrow_forwardWhich of the following occurs at this point of the membrane potential (marked by the black arrow) in autorhythmic cells? (A) A (B) B (C) C (D) Darrow_forwardWhy, in physiological terms, does systolic blood pressure increase from rest to exercise and why would diastolic blood pressure remain relatively constant from rest to exercise? Discuss the roles of the nervous system, endocrine, and baroreceptorsarrow_forward
- Discuss in details the unique structure of a cardiac muscle fiber.arrow_forward1) Where the action potential is generated (i.e. atria or ventricles) 2) What actions are occurring during this process (i.e. contraction and ion flow) 3) When relaxation occursarrow_forwardBased on Starling’s Law, how would increased blood flow to the heart during diastole (remember, this is when heart is filling with blood) affect cardiac muscle contractions?arrow_forward
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