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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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 NOT a population of pacemaker cells in the heart? a. papillary muscles b. sinoatrial (SA) node c. atrioventricular (AV) node d. Purkinje fiber system
Conduction of a neural signal through the walls of the ventricles of the heart is accomplished along:
A. Interatrial Fibers
B. The sinoatrial node
C. The AV bundle
D. The purkinje fibers
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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- The heart’s internal pacemaker beats by: a. an internal implant that sends an electrical impulse through the heart b. the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node c. the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node d. the action of the sinusarrow_forwardWhen 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_forward
- Which 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_forwarda 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 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 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 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_forward
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