Question

multiple choice question
the group of autorhythmic cells in the interatrial septum of the heart that relays excitation from the atria to the ventricles is known as the

atrioventricular node
junctional node
sinoatrial node

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Explanation:

The atrioventricular node is located in the interatrial septum and relays excitation from the atria to the ventricles. The sinoatrial node is the heart's natural pace - maker and starts the electrical impulse, not the relay from atria to ventricles. There is no "junctional node" in this context as a standard term for this function.

Answer:

A. atrioventricular node