Cardiopulmonary Anatomy & Physiology
7th Edition
ISBN: 9781337794909
Author: Des Jardins, Terry.
Publisher: Cengage Learning,
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Textbook Question
Chapter 12, Problem 9RQ
An electrical difference across the fibers of the heart is called the
A. Absolute refractory period
B. Resting membrane potential
C. Action potential
D. Depolarization
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Chapter 12 Solutions
Cardiopulmonary Anatomy & Physiology
Ch. 12 - 1. Which of the following is the rapid upstroke in...Ch. 12 - Prob. 2RQCh. 12 - Prob. 3RQCh. 12 - Prob. 4RQCh. 12 - Which of the following slows the heart rate and AV...Ch. 12 - Prob. 6RQCh. 12 - Prob. 7RQCh. 12 - Which of the following means the ability to...Ch. 12 - An electrical difference across the fibers of the...Ch. 12 - Prob. 10RQ
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- When can a strong stimulus cause an unwanted depolarization of the heart? A. Absolute refractory period B. Relative refractory period C. Nonrefractory period D. Phase 0arrow_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 the correct term to indicate that the heart muscle is the source of the electrical signal that stimulates heart contraction? a. Myogenic b. Myopathy c. Myocardium d. Myotonia e. Myositisarrow_forward
- a calcium channel blocker or an antagonist drug will produce a. vasoconstriction b. increase in blood pressure c. increase in total peripheral resistance d. reduction in cardiac muscle contractilityarrow_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_forwardWhich of the following structures provides the anchoring site for the valves of the heart and prevents the conduction of electrophysiologic impulses form the atria to the ventricles? A. Chordae Tendineae B. Fibrous Pericardium C. Fibrous Skeleton of the heart D. MyocardiumE. Sinus Venosumarrow_forward
- which of the following is TRUE for a cardiac cycle? a. it only includes pressure changes that occur during one heart beat b. it refers to volume changes that occur in one heart beat c. it includes mechanical events during one complete heart beat d. it refers to electrical activity of the heart during one complete heart beatarrow_forwardWhich of the following channels are involved in the action potential in contractile cells of the heart? a.Na+ leak channels b.voltage-gated Na+ channels c.voltage-gated Ca channels d. all of the above e. B and C onlyarrow_forwardWhich component of the heart conduction systemwould have the slowest rate of firing?a. atrioventricular nodeb. atrioventricular bundlec. bundle branchesd. Purkinje fibersarrow_forward
- During the systolic phase of the cardiac cycle, the heart is. a. contracting b. relaxing c. contracting and relaxing d. filling with bloodarrow_forwardWhich portion of the heart contains the most myocardium? Select one: a.right atrium b.left atrium c.left ventricle d.right ventricle e.both right and left ventriclesarrow_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
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