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 12CP
What happens during each of the three phases of an action potential in ventricular contractile fibers?
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Describe what is isovolumetric ventricular contraction?
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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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- Parasympathetic stimulation also increases the delay between atrial and ventricular contractions. What is the ionic mechanism?arrow_forwardVentricular Contractility increases in response to circulating Epinephrine. What factor is responsible for this increase in the force of the contraction?arrow_forwardPressure changes that occur during the cardiac cycle are responsible for what two physiologic processes within the heart?arrow_forward
- Why do the coronary arteries carry a greater blood flow during ventricular relaxation than they do during ventricular contraction?arrow_forwardWhich of the following channels is responsible for generating the long plateau found in the action potentials of ventricular myocytes? a-slow Na+ channels b-slow Ca2+ channels c-leaky Ca2+ channels d-leaky Na+ channelsarrow_forwardThe entry of calcium into a ventricular muscle cell helps to maintain depolarization of the membrane during the plateau phase of the action potential, but this calcium also performs what other function?arrow_forward
- Describe the electrical event in the heart that occurs during each of the following: (a) the QRS wave of the ECG; (b) the T wave of the ECG; (c) the P-R interval of the ECG.arrow_forwardDefine the term isovolumetric ventricular relaxation?arrow_forwardHow does the long plateau of the cardiac action potential develop and what is its functional role?arrow_forward
- What events occur in the ventricles during late ventriculardiastole?arrow_forwardDoes the right ventricular stroke work index (RVSWI) measure the amount of work required by the right ventricle to pump blood? How?arrow_forwardThe effective-refractory period present during Phase 2 of the actionpotential of ventricular myocytes:A)is relatively long because the Na+ current does not inactivate. B) is relatively long because K+ current is immediately activated once membrane potential becomes positive. C) prevents tetanus in the heart. D) is about twice as long as in skeletal musclearrow_forward
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