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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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 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)
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.
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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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
- Contractions 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_forwardWhich of the following is true about the pacemaker potential in the heart? a. Decreased K+ efflux causes the resting membrane potential to increase b. Action potential occurs when T-type Ca2+ channels open c. Only the SA node in the heart has a pacemaker potential d. The atrioventricular node is needed to pace the sinoatrial node e. None of the options are truearrow_forward
- It is generally accepted that a relatively low diastolic vascular pressure is more important than a relatively low systolic vascular pressure because: A. diastolic vascular pressure is the pressure that determines the length of diastole. B. diastolic vascular pressure directly determines stroke volume. C. diastolic vascular pressure ultimately determines and controls contractility. D. diastolic vascular pressure is a force the heart must compete with to open the aortic valve.arrow_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_forwardWhich cell types are associated with spontaneous action potential generation in the absence of an external stimulus from other tissues. A. Sino-Atrial node cells (SA node). B. Atrial cells C. Ventricular cells. D. Endothelial cells. E. A and D.arrow_forward
- The pacemaker cardiac muscle cells rely on ______________ for their action potentials. a. Na+ leak channels and fast voltage-gated Na+ channels b. Ca+2 leak channels and slow voltage-gated Ca+2 channels c. Na+ leak channels and fast voltage-gated Ca+2 channels d. Ca+2 leak channels and fast voltage-gated Ca+2 channelsarrow_forwardGiven these characteristics:Matrix composed almost entirely of extracellular collagen fibers. It is able to withstand great pulling forces. Which of the tissue is described? A. Adipose. B.Cartilage. C.Bone. D. Dense connective tissue. E.Loose connective tissue 2. According to Frank-Starling law of the heart, A.increased preload causes increased cardiac output. B.increased afterload causes increased cardiac output. C.decreased preload causes increased afterload. D.afterload influences cardiac output more than preload. E.cardiac output is not influenced by preload.arrow_forwardIn some reptiles, the two layers of dura mater fuse together in the brain. What is a likely consequence of this finding? Group of answer choices a. Because the two layers are fused, it will form a stronger blood-brain barrier. b. Arteries are not able to pass through the two layers, so they must be rerouted around the dura mater. c. With no space between layers, blood cannot be collected here for return to the venous system. d. There will be increased damage to the tissue compared to mammals because in mammals, serous fluid between the layers reduces friction.arrow_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 is not true for conduction of the cardiac impulse? A. Action potentials propagate by current flow through gap junctions. B. Slow propagation occurs due to high longitudinal resistance. C. Slow propagation requires a slower (sustained) current source (i.e. Ca). D. Fast propagation occurs as a result of high intercellular conductance. E. All are true.arrow_forwardConcerning the development of the heart,a. the heart develops from a single tube, which results from the fusionof two tubes.b. the SA node develops in the wall of the sinus venosus.c. the foramen ovale lets blood flow from the right atrium to the leftatrium.d. the bulbus cordis is absorbed into the ventricle.e. All of these are correct.arrow_forward
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