Which Statement About the Conduction System in the Mammalian Heart

question 163

Multiple Choice

Which statement about the conduction system in the mammalian heart is false?

• A) Gap junctions between cells of the atria and cells of the ventricles allow action potentials to spread directly from the atria to the ventricles.
• B) Atrial depolarization leads directly to depolarization of the atrioventricular node.
• C) Cells of the atria are electrically coupled and contract in unison.
• D) Following atrial contraction there is a slight delay, and then the ventricles contract.
• E) Purkinje fibers penetrate the walls of the ventricles.

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