Conduction of Action Potential

Use the interactive figure below to trace the pathway of the action potential over the heart and to identify the locations of the parts of the conduction system.

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QUESTION: What other structure has a cellular structure similar to that of the AV node?   Answer

QUESTION: What is the main direction of the action potential during the main phase of ventricular excitation?    Answer

QUESTION: Why is the electrocardiogram flat in the interval between the P wave and the Q wave?   Answer

QUESTION: Why doesn't the action potential travel directly from the bottom of the atria into the top of the ventricles?   Answer

QUESTION: What might happen if a small, abnormal piece of muscle tissue created a connection across the connective tissue, so that the action potential at one spot could move directly from the atria into the top of a ventricle?   Answer