What can you say about the amplitude of the various waves in different cardiac cycles?The P wave and the QRS complex represent depolarization of the atrial and ventricular muscle respectively. Why does the QRS complex have the largest amplitude?In Steps 7 and 8, heart rate was calculated based upon the peak-to-peak interval of the R waves. Was there variability between the beats? Would you expect the interval between beats to be identical? Why or why not?The range for a normal resting heart rate is 60 to 90 bpm. A trained athlete could have a resting heart rate of 45 to 60 bpm. Why might a very fit person have a slower heart rate than someone of average fitness?Are the amplitudes and durations of the various waves in different individuals similar or very different?What variations in heart rate did you observe between individuals?Explain why ventricular contraction (systole) and the ‘lub’ sound occur immediately after the QRS complex.Explain why ventricular relaxation (diastole) and the ‘dub’ sound occur after the T wave.

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Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter9: Cardiac Physiology

Section: Chapter Questions

Problem 4TAHL

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What can you say about the amplitude of the various waves in different cardiac cycles?
The P wave and the QRS complex represent depolarization of the atrial and ventricular muscle respectively. Why does the QRS complex have the largest amplitude?
In Steps 7 and 8, heart rate was calculated based upon the peak-to-peak interval of the R waves. Was there variability between the beats? Would you expect the interval between beats to be identical? Why or why not?
The range for a normal resting heart rate is 60 to 90 bpm. A trained athlete could have a resting heart rate of 45 to 60 bpm. Why might a very fit person have a slower heart rate than someone of average fitness?
Are the amplitudes and durations of the various waves in different individuals similar or very different?
What variations in heart rate did you observe between individuals?
Explain why ventricular contraction (systole) and the ‘lub’ sound occur immediately after the QRS complex.
Explain why ventricular relaxation (diastole) and the ‘dub’ sound occur after the T wave.

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