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?

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A:

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