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Cardiopulmonary Anatomy & Physiology
7th Edition
ISBN: 9781337794909
Author: Des Jardins, Terry.
Publisher: Cengage Learning,
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Chapter 12, Problem 4RQ
Summary Introduction
Introduction:
Heart is a muscular organ that pumps blood throughout the blood vessels. It helps in providing oxygen and nutrients and removes carbon dioxide and other
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Students have asked these similar questions
Which of the following is true of the EKG?
A. Depolarization of the atria cannot be seen on the EKG
B. Repolarization of the atria cannot be seen on the EKG.
C. Depolorization of the ventricles cannot be seen on the EKG.
D. Repolorazition of the ventricles cannot be seen on the EKG.
Which 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.
The effects of the sympathetic and parasympathetic neurons on the heart can best be described as
a. antagonistic
b. identical
c. cooperative
d. adrenergic
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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- On an ECG, if every other P wave (e.g., every even is, and every odd is not) is NOT followed by the QRS complex, this is: A. first degree AV block B. second degree AV block C. third degree AV block D. atrial fibrillationarrow_forwardWhich of the following statements is true about the SA (sinoatrial) node? a. The action potential created by the pacemaker cells of the SA node directly stimulates the contractile cells of both the atria and ventricles. b. The rate of spontaneous depolarization of nodal cells is the fastest in the SA node. c. Pacemaker cells in the SA node form a pathway between the SA and AV nodes. d. The pacemaker cells, which establish the heart rate, are located only in the SA node.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_forward
- The QRS wave of an ECG (or EKG) represents: a. depolarization of the ventricles. b. Depolarization and repolarization of the ventricles. c. Depolarization of the atria and ventricles. d. depolarization of the atria.arrow_forwardUsing the ECG recording provided below, how do we know that this extrasystole event (i.e., indicated by the arrow) is occurring in the ventricles and not the atria? a. None of the options are correct b. Extrasystole event is smaller in amplitude than the QRS complex c.Event occurs after a T-wave d.Large ECG amplitude compared with the P-wave e.Event occurs after a P-wavearrow_forwardWhat event(s) occur during the QRS complex of an electrocardiogram? Select one: a. Repolarization of the ventricles b. Depolarization of the atria and repolarization of the ventricles c. Depolarization of the ventricles and repolarization of the atria d. Depolarization of the atriaarrow_forward
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