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1. Explain why the larger waves seen on the oscilloscope represent ventricular contraction. 2. Explain why the amplitude of the wave did not change when you increased the frequency of the stimulation. (Hint: Relate your response to the refractory period of the cardiac action potential.) How well did the results compare with your prediction 3. Why is it only possible to induce an extrasystole during relaxation? 4. Explain why wave summation and tetanus are not possible in cardiac muscle tissue. How well did the results compare your prediction?

1. Explain why the larger waves seen on the oscilloscope represent ventricular contraction. 2. Explain why the amplitude of the wave did not change when you increased the frequency of the stimulation. (Hint: Relate your response to the refractory period of the cardiac action potential.) How well did the results compare with your prediction 3. Why is it only possible to induce an extrasystole during relaxation? 4. Explain why wave summation and tetanus are not possible in cardiac muscle tissue. How well did the results compare your prediction?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Activity 1: Investigating the Refractory Period of Cardiac Muscle** 1. Explain why the larger waves seen on the oscilloscope represent ventricular contraction. ______________________________________________________________________ 2. Explain why the amplitude of the wave did not change when you increased the frequency of the stimulation. (Hint: Relate your response to the refractory period of the cardiac action potential.) How well did the results compare with your prediction? ______________________________________________________________________ 3. Why is it only possible to induce an extrasystole during relaxation? ______________________________________________________________________ 4. Explain why wave summation and tetanus are not possible in cardiac muscle tissue. How well did the results compare with your prediction? ______________________________________________________________________
Transcribed Image Text:**Activity 1: Investigating the Refractory Period of Cardiac Muscle** 1. Explain why the larger waves seen on the oscilloscope represent ventricular contraction. ______________________________________________________________________ 2. Explain why the amplitude of the wave did not change when you increased the frequency of the stimulation. (Hint: Relate your response to the refractory period of the cardiac action potential.) How well did the results compare with your prediction? ______________________________________________________________________ 3. Why is it only possible to induce an extrasystole during relaxation? ______________________________________________________________________ 4. Explain why wave summation and tetanus are not possible in cardiac muscle tissue. How well did the results compare with your prediction? ______________________________________________________________________
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