ANATOMY & PHYSIOLOGY: AN INTEGRATIVE APP
3rd Edition
ISBN: 9781266163654
Author: McKinley
Publisher: MCG
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Textbook Question
Chapter 19, Problem 5CAL
During surgery, the right vagus nerve was accidently cut. Explain the effect to 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 heart rate becomes zero.
- d. The heart rate decreases to the inherent rhythm of SA nodal cells.
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Students have asked these similar questions
SA node is the main pacemaker of the heart. Why is the normal heart rate lower than the intrinsic firing rate of the SA node?
A. sympathetic inputs from the hypothalamus are slowing it down
B. parasympathetic inputs from medulla oblongata are slowing it down
C. there is inertia in heart muscle as it takes time for impulse to spread through all the cells
D. centrifugal inputs from the AV node are slowing it down
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.
Which of the following is not true for conduction of the cardiac impulse?
A. Action potentials propagate by current flow through gap junctions.
B. Slow propagation occurs as a result of low intercellular conductance.
C. Slow propagation requires a slower (sustained) current source (1.e. Ca).
D. Fast propagation occurs as a result of high intercellular conductance.
E. All are true.
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
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