Q6 - Reading Cardiac Cycle Information from an ECG
An important function of an electrocardiogram (ECG) is to give information about the general health of a person. The ECG of two students was compared (Fig. C).
A, schematic representation of a standardized ECG; B, a snapshot of a heart with activitated innervations in red, pictured as if facing the student; C, electrocardiograms of two young male students (I and II) measured over 3 seconds.
Figure 1.
Figure 2.
Using the information and data, determine which of the statements are true or which are false.
A. Blood flows from the right ventricle to the lungs, to the left atrium, to the left ventricle, to the body, and back to the right atrium
B. Students I has a heart rate of 80 beats/minute
C. If the stroke volume of student 1 is 70 mL/beat, then his cardiac output will be about 4.4 L/minute
D. The heart in fig. B is at the R peak
Question reproduced from IBO 2015, Theoretical Exam B, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)