4. How are autorhythmic pacemaker cells in the conducting system of the heart different from normal contractile myocardial cells? Describe the action potential in each type of cell (which ion channels open, and when) and indicate what each type of cell does in the heart.
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They are different from normal contractile myocardial cells in several ways: Show more…
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Please compare and contrast action potentials in cardiac autorhythmic cells and cardiac contractile cells, including drawings to illustrate your discussion. Would increased sympathetic nervous system activity affect either of these cells? If so, please describe how, including the cellular mechanism that produces the effect. What effect(s) would this have on overall cardiac function?
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Explain why cardiac cells are considered autorhythmic and how this occurs. Describe the pathway of electrical conduction through the heart and the purpose of each step.
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Short answer (answer on the back of page): Diagram the chambers, valves and cardiac conducting system of the heart. Note on your heart diagram the location of the autorhythmic vs contractile cardiomyocytes. List the events of the cardiac cycle of the left heart. How is a cardiac action potential different from a skeletal muscle action potential? List the order of the cardiac conducting system.
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