LooseLeaf for Human Anatomy
5th Edition
ISBN: 9781259285271
Author: Michael McKinley Dr., Valerie O'Loughlin, Elizabeth Pennefather-O'Brien
Publisher: McGraw-Hill Education
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Chapter 22, Problem 8MC
Summary Introduction
Introduction:
The heart is stimulated by the autonomic nervous system. This innervation involves sympathetic and parasympathetic components. These components are collectively known as the cardiac plexus. The innervations by autonomic centers in the brainstem do not initiate a heartbeat, but it can increase or decrease the rate of the heartbeat.
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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.
Which cell types are associated with spontaneous action potential generation in the absence of an external stimulus from other tissues.
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Sino-Atrial node cells (SA node).
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Chapter 22 Solutions
LooseLeaf for Human Anatomy
Ch. 22 - What is the basic distinction between arteries and...Ch. 22 - Prob. 2WYLCh. 22 - Prob. 3WYLCh. 22 - Identify the layers of the pericardium. Why is the...Ch. 22 - Prob. 5WYLCh. 22 - What are two similarities and two differences...Ch. 22 - What is the composition and function of the...Ch. 22 - Prob. 8WYLCh. 22 - Prob. 9WYLCh. 22 - Prob. 10WYL
Ch. 22 - Prob. 11WYLCh. 22 - Prob. 12WYLCh. 22 - Prob. 13WYLCh. 22 - What events occur in the ventricles during late...Ch. 22 - Prob. 15WYLCh. 22 - Match each numbered item with the most closely...Ch. 22 - Prob. 1MCCh. 22 - Prob. 2MCCh. 22 - Prob. 3MCCh. 22 - Prob. 4MCCh. 22 - Prob. 5MCCh. 22 - In the developing heart, the atria form from the...Ch. 22 - The irregular muscular ridges in the ventricular...Ch. 22 - Prob. 8MCCh. 22 - Prob. 9MCCh. 22 - The thickest part of the heart wall is the a....Ch. 22 - What are the differences between the pulmonary and...Ch. 22 - Prob. 2CRCh. 22 - Prob. 3CRCh. 22 - Where is the fibrous skeleton of the heart...Ch. 22 - Prob. 5CRCh. 22 - Prob. 6CRCh. 22 - Identify and compare the branches of the right and...Ch. 22 - Compare cardiac and skeletal muscle. In what ways...Ch. 22 - Prob. 9CRCh. 22 - Prob. 10CRCh. 22 - It was the end of the semester, and Huang had...Ch. 22 - Prob. 2DCR
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- Action potentials are spread rapidly between cardiac muscle cells by a. sarcomeres. b. intercalated discs. c. chemical neurotransmitters. d. the fibrous skeleton.arrow_forwardparasympathetic nerve stimulation in the heartt will result in A.decreased heart rate B.increased vescular resistence . C. decrease venous tone D. both a and barrow_forwardParasympathetic nerve fibers are found in the nerves andrelease at the heart.a. cardiac, acetylcholineb. cardiac, norepinephrinec. vagus, acetylcholined. vagus, norepinephrinearrow_forward
- The effects of the sympathetic and parasympathetic neurons on the heart can best be described as a. antagonistic b. identical c. cooperative d. adrenergicarrow_forwardIncreased blood pressure is detected by the baroreceptors in the carotid artery and aortic arch causing them to send action potentials to the medulla oblongata. What are the 2 main nerves that conduct action potentials from the baroreceptors to the medulla oblongata? a. vagus nerve and glossopharyngeal nerve b. facial nerve and glossopharyngeal nerve c. optic nerve and vagus nerve d. hypoglossal nerve and facial nervearrow_forwardWhich neurotransmitter/target receptor combinations would you expect to find in these areas of the heart?( note: you may have more than one answer for each question. Some may not be used.) a. ACh on nicotinic receptors B. ACh on muscarinic receptors C. Epi on B2 receptors D. NE or EPI on Alpha 1 receptors E. NE or EPI on B1 receptors 1. SA node 2. AV node 3. Ventricular Myocardiumarrow_forward
- 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)arrow_forwardSA 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 downarrow_forwardIf both sympathetic and parasympathetic innervation to the heart conductive system were removed, which of the followings will take place at the heart? O a. Cardiac output will decrease. O b. Stroke volume will increase. O c. SA node will stop functioning. d. Heart rate will increase up to 100beats/min. e. Heart will stop beating.arrow_forward
- What is another name for the preganglionic sympathetic fibers that project to the heart?a. solitary tractb. vasomotor nervec. vagus nerved. cardiac accelerator nervearrow_forwardThe atrioventricular node is located in the: A. right atrium B. right ventricle C. septum between the right and left atrium D. juncture between the right atrium and ventricle Preganglionic parasympathetic neurons release NT that binds to: A. nicotinic acetylcholine ligand-gated receptors B. muscarinic acetylcholine GPCRs C. beta-1 norepinephrine GPCRs D. norepinephrine ligand-gated receptorsarrow_forwardIf the initial level of sympathetic tone were not present, then only vasoconstriction could occur as a result of sympathetic division activity. A. True B. Falsearrow_forward
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