Anatomy & Physiology: An Integrative Approach
2nd Edition
ISBN: 9780078024283
Author: Michael McKinley Dr., Valerie O'Loughlin, Theresa Bidle
Publisher: McGraw-Hill Education
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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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Which of the following statement/s is/are not true about regulation of heart rate?
A. The brainstem contains the cardiac centers which are the accelerator center and the inhibitory center. (medulla)
B. Sympathetic impulses to the heart increase rate and force of contraction.
C. Parasympathetic impulses from cranial nerve X to the heart causes reduction in the heart rate.
D. The cranial nerve IX is motor for the carotid receptors. (sensory)
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
When cardiac muscle tissue dies in adults, it is replaced with scar tissue composed of dense connective tissue. Explain how scar tissue would affect the function of the cardiac muscle tissue.
A. The scar tissue binds the cardiac muscle together more tightly so heart muscle contractions are less vigorous.
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D. The dense connective tissue of the scar tissue transmits the electrical signals to other cardiac muscle cells in the heart allowing the signal to skip over the scar tissue.
Chapter 19 Solutions
Anatomy & Physiology: An Integrative Approach
Ch. 19.1 - What are the potential consequences of a failing...Ch. 19.1 - Prob. 2WDYLCh. 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 - Prob. 5WDYLCh. 19.2 - Describe the three layers that cover the heart....Ch. 19.3 - Prob. 7WDYLCh. 19.3 - What are the layers of the heart (in order) that a...Ch. 19.3 - What is the structure that separates the two...Ch. 19.3 - What are the functions of the tendinous cords and...
Ch. 19.3 - Which features of cardiac muscle support aerobic...Ch. 19.3 - Which function of the fibrous skeleton allows the...Ch. 19.4 - What areas of the heart are deprived of blood when...Ch. 19.4 - Prob. 14WDYLCh. 19.5 - Prob. 15WDYLCh. 19.5 - Which autonomic division is associated with the...Ch. 19.6 - Prob. 17WDYLCh. 19.6 - What is autorhythmicity? Describe how nodal cells...Ch. 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 - In which direction does Ca2+ move in response to...Ch. 19.7 - What three electrical events occur at the...Ch. 19.7 - What is the significance of the extended...Ch. 19.7 - What events in the heart are indicated by each of...Ch. 19.8 - Pressure changes that occur during the cardiac...Ch. 19.8 - What is occurring during ventricular ejection?Ch. 19.8 - Prob. 27WDYLCh. 19.8 - Define end-diastolic volume, end-systolic volume,...Ch. 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. 31WDYLCh. 19.9 - Describe the atrial reflex, which involves...Ch. 19.9 - Prob. 33WDYLCh. 19.9 - Prob. 34WDYLCh. 19.10 - What would be the path of blood flow through the...Ch. 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. 11DYKBCh. 19 - Compare the structure, location, and function of...Ch. 19 - Prob. 13DYKBCh. 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. 18DYKBCh. 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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- 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_forwardContractions in the heart are controlled via a well-regulated electrical signaling cascade that originates in pacemaker cells in the _______ node and is passed via internodal atrial pathways to the ________, the __________, the___, and to all parts of the _________. A. sinoatrial node B. ventricle C. Purkinje system D. Bundle of His E. atrioventricular nodearrow_forwardWhich 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.arrow_forward
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