Cardiopulmonary Anatomy & Physiology
7th Edition
ISBN: 9781337794909
Author: Des Jardins, Terry.
Publisher: Cengage Learning,
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Chapter 13, Problem 8RQ
Summary Introduction
Introduction:
Electrocardiography is a technique by which electrical activity of the heart is recorded. This uses a standard 12-lead system which consists of positive and negative electrodes that measure the electrical activities of different regions of the heart. These activities are recorded on a graph which is called the electrocardiogram (ECG). The electrocardiogram consists of intervals, waveforms, segments, and baselines. The standard ECG contains the P wave, PR interval, QRS complex, T wave, U wave, QT interval, and ST segments. The QRS complex has a higher amplitude than the P wave and consists of three waveforms, which are Q wave, S wave, and R wave.
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The normal duration of the PR interval is no longer than A. 0.12 second B. 0.15 second C. 0.20 second D. 0.50 second
The normal duration of the T wave is A. 0.05 second or less B. 0.10 second or less C. 0.15 second or less D. 0.20 second or less
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Cardiopulmonary Anatomy & Physiology
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