ANATOMY & PHYSIOLOGY: AN INTEGRATIVE APP
3rd Edition
ISBN: 9781266163654
Author: McKinley
Publisher: MCG
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Textbook Question
Chapter 19, Problem 5DYB
_____ 5. Calcium channels in the nodal cells function to
- a. cause depolarization and initiate the cardiac action potential.
- b. assure excess calcium can leave the cell.
- c. bring the cell quickly to its resting membrane potential.
- d. sustain contraction of the cell.
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Students have asked these similar questions
The pacemaker cardiac muscle cells rely on ______________ for their action potentials.
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Action potentials are spread rapidly between cardiac muscle cells by a. sarcomeres.
b. intercalated discs.
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Chapter 19 Solutions
ANATOMY & PHYSIOLOGY: AN INTEGRATIVE APP
Ch. 19.1 - Prob. 1LOCh. 19.1 - WHAT DID YOU LEARN?
1 Define perfusion. Why would...Ch. 19.1 - Prob. 2LOCh. 19.1 - LEARNING OBJECTIVE
3. Describe the general...Ch. 19.1 - WHAT DO YOU THINK?
1 What vessels attached to the...Ch. 19.1 - Prob. 2WDLCh. 19.1 - Prob. 3WDLCh. 19.1 - Prob. 4WDLCh. 19.1 - Prob. 5WDLCh. 19.1 - Prob. 4LO
Ch. 19.1 - What path does blood follow through the heart?...Ch. 19.1 - Which of the great vessels is both an artery and...Ch. 19.2 - LEARNING OBJECTIVE
5. Describe the location and...Ch. 19.2 - Prob. 8WDLCh. 19.2 - Prob. 9WDLCh. 19.2 - Prob. 6LOCh. 19.2 - Prob. 7LOCh. 19.2 - Describe the three layers that cover the heart....Ch. 19.3 - LEARNING OBJECTIVE
8. Compare the superficial...Ch. 19.3 - Prob. 11WDLCh. 19.3 - Prob. 12WDLCh. 19.3 - Prob. 13WDLCh. 19.3 - Prob. 9LOCh. 19.3 - What are the layers of the heart (in order) that a...Ch. 19.3 - Prob. 10LOCh. 19.3 - What is the structure that separates the two...Ch. 19.3 - Prob. 16WDLCh. 19.3 - Prob. 11LOCh. 19.3 - What are the functions of the tendinous cords and...Ch. 19.3 - Prob. 12LOCh. 19.3 - Which function of the fibrous skeleton allows the...Ch. 19.3 - Prob. 13LOCh. 19.3 - Prob. 14LOCh. 19.3 - Prob. 15LOCh. 19.3 - Which features of cardiac muscle support aerobic...Ch. 19.4 - Prob. 16LOCh. 19.4 - Prob. 17LOCh. 19.4 - Prob. 18LOCh. 19.4 - Prob. 2WDTCh. 19.4 - What areas of the heart are deprived of blood when...Ch. 19.4 - Prob. 19LOCh. 19.4 - Prob. 21WDLCh. 19.5 - Prob. 20LOCh. 19.5 - Prob. 22WDLCh. 19.5 - Prob. 21LOCh. 19.5 - Which autonomic division is associated with the...Ch. 19.6 - LEARNING OBJECTIVE
22. Describe a nodal cell at...Ch. 19.6 - Prob. 24WDLCh. 19.6 - Prob. 23LOCh. 19.6 - Prob. 24LOCh. 19.6 - Prob. 3WDTCh. 19.6 - What is autorhythmicity? Describe how nodal cells...Ch. 19.6 - Prob. 25LOCh. 19.6 - What is the path of an action potential through...Ch. 19.6 - What anatomic features slow the conduction rate of...Ch. 19.7 - Prob. 26LOCh. 19.7 - In which direction does Ca2+ move in response to...Ch. 19.7 - Prob. 27LOCh. 19.7 - Prob. 28LOCh. 19.7 - Prob. 4WDTCh. 19.7 - What three electrical events occur at the...Ch. 19.7 - Prob. 29LOCh. 19.7 - Prob. 30LOCh. 19.7 - What is the significance of the extended...Ch. 19.7 - Prob. 31LOCh. 19.7 - What events in the heart are indicated by each of...Ch. 19.8 - Prob. 32LOCh. 19.8 - Prob. 33LOCh. 19.8 - Pressure changes that occur during the cardiac...Ch. 19.8 - Prob. 34LOCh. 19.8 - Prob. 35LOCh. 19.8 - What is occurring during ventricular ejection?Ch. 19.8 - Prob. 34WDLCh. 19.8 - Define end-diastolic volume, end-systolic volume,...Ch. 19.9 - Prob. 36LOCh. 19.9 - Prob. 37LOCh. 19.9 - What are the two factors that determine cardiac...Ch. 19.9 - What is the cardiac output at rest and during...Ch. 19.9 - Prob. 38LOCh. 19.9 - Prob. 39LOCh. 19.9 - Prob. 38WDLCh. 19.9 - Describe the atrial reflex, which involves...Ch. 19.9 - Prob. 40LOCh. 19.9 - Prob. 41LOCh. 19.9 - Prob. 40WDLCh. 19.9 - Prob. 42LOCh. 19.9 - Prob. 41WDLCh. 19.10 - Prob. 43LOCh. 19.10 - Prob. 44LOCh. 19.10 - Prob. 42WDLCh. 19 - Which of the following is the correct circulatory...Ch. 19 - The pericardial cavity is located between the a....Ch. 19 - How is blood prevented from backflowing from the...Ch. 19 - ____ 4. Venous blood draining from the heart wall...Ch. 19 - _____ 5. Calcium channels in the nodal cells...Ch. 19 - ____6. Action potentials are spread rapidly...Ch. 19 - Why is it necessary to stimulate papillary muscles...Ch. 19 - ____ 8. Preload is a measure of a. stretch of...Ch. 19 - ____ 9. All of the following occur when the...Ch. 19 - ____10. What occurs during the atrial reflex? a....Ch. 19 - Prob. 11DYBCh. 19 - Compare the structure, location, and function of...Ch. 19 - Prob. 13DYBCh. 19 - Explain why the walls of the atria are thinner...Ch. 19 - Describe the structure and function of...Ch. 19 - Explain the general location and function of...Ch. 19 - Describe the functional differences in the effects...Ch. 19 - Prob. 18DYBCh. 19 - List the five events of the cardiac cycle, and...Ch. 19 - Define cardiac output, and explain how it is...Ch. 19 - A young man was doing some vigorous exercise when...Ch. 19 - A young man was doing some vigorous exercise when...Ch. 19 - Prob. 3CALCh. 19 - Prob. 4CALCh. 19 - During surgery, the right vagus nerve was...Ch. 19 - Prob. 1CSLCh. 19 - Prob. 2CSLCh. 19 - Your grandfather was told that his SA node...
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- During surgery, the right vagus nerve was accidently cut. Explain the effect on the heart rate. a. There is no change to the heart rate because the vagus nerve does not innervate the heart. b. The heart rate increases to the inherent rhythm of SA nodal cells. c. The heart stops beating, and the heart rate becomes zero. d. The heart rate decreases to the inherent rhythm of SA nodal cells.arrow_forwardWhich of the following would not increase Cardiac Output? A. increase blood epinephrine concentration B. Increase Atrial Preload C. Increase Cardiac sarcoplasmic calcium concentration D. Increase Arterial Afterloadarrow_forwardthe opening of what channel will cause the plateau phase of an action potential of ventricular contractile muscle cells a. t type calcium channels b. voltage gated potassium channels c. voltage gated sodium channels d. l type calcium channelsarrow_forward
- Which of the following is true of propagation of longitudinal electrical flow in cardiac muscle. A. Current flows longitudinally from a region of depolarization through ryanodine receptors. B. Longitudinal current flows through inward rectifier potassium channels. C. This current can be detected at the body surface, if the source is large enough. D. A and B. E. All are true.arrow_forwardSelect the correct one, Which of the following would not increase Cardiac Output? A. increase blood epinephrine concentration B. Increase Atrial Preload C. Increase Cardiac sarcoplasmic calcium concentration D. Increase Arterial Afterloadaarrow_forwardCells in the body have the ability to undergo a transiet depolarization and repolarization. A. Plot the action potential of non-pacemaker cardiac myocyte and indicate what kinds of ion channels involved in each phase and compare ion movement during a myocardial cell's action potential to ion movement of a neuron's action potential. B.Explain why contractions in the cardiac muscle cells are different to skeletal muscle cells.arrow_forward
- Acetylcholine reacting with a muscarinic receptor on a cardiac myocyte causes chloride to flow, or an: A. Action potential B. IPSP C. EPSP D. None of the above.arrow_forwardThe heart’s internal pacemaker beats by: a. an internal implant that sends an electrical impulse through the heart b. the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node c. the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node d. the action of the sinusarrow_forward10- Which of the following is a potent vasoconstrictor? a) ADP b) Serotoninarrow_forward
- Ventricular cardiomyocytes under sympathetic drive during a bout of exercise... a. Would collectively make more force than at rest due to recruitment of more cardiomyocytes b. Would relax faster due to phosphorylation of the cardiac ryanodine receptors c. Would pump out more SV despite a decrease in EDV d. Would show an increased rate of myosin ATPase activity due to phosphorylation of the calcium ATPase pumps e. Would have elevated levels of cAMP and kinase activityarrow_forwardwhich of the following factors will increase the cardiac output? a. decreased heart rateb. increased stroke volumec. increased end-systolic volume d. decreased sympathetic activitye. decreased venous returnarrow_forwarda. Ventricular diastole b. Throughout the cardiac cycle c. Between cardiac cycles d. Ventricular systolearrow_forward
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