Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

The small squares on the standard ECG paper represent

A. 0.02 second

B. 0.04 second

C. 0.06 second

D. 0.08 second

Summary Introduction


The electrocardiogram (ECG) is a process through which the electrical activity of the heart is recorded on a characteristic graph paper. The heart is myogenic, that means it consists of specific cardiac muscles that can generate electrical impulses on their own. The sinoatrial nodes are the pacemakers of the heart. The ECG records the electrical activity of the heart on a graphical paper where different tracings are present. The tracings correspond to the systole, diastole and other processes in the heart. The graphical representation has a characteristic amplitude, direction, and duration of the different tracings. The standard ECG uses a 12-lead system, which are the electrodes.


Justification/ Explanation for the correct answer:

Option (b) is 0.04. The small squares present in the standard ECG paper or graph represent a time interval of 0.04 seconds. The standard ECG paper runs at the speed of 25 millimeters per second, which is the same speed the ECG system. It consists of small and large squares that denote a specific time duration. One large square corresponds to duration of 0.20 seconds and thus, the small squares present in it correspond to 0.04 seconds. Hence, option (b) is correct.

The explanation for the incorrect answers:

Option (a) is 0.02. The ECG graph paper consists of large and small squares. One large square has time duration of 0.20 seconds and contains five small squares...

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