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Biology Help Question

In a question I was doing about the role of the atrio-ventricular node and Bundle of His/Purkyne fibres, in the cardiac cycle, when I looked at the mark scheme, for example, for the atrio-ventricular node, it states:
passes {impulse/electrical signal} down {Purkinje / Purkyne fibres / Bundle of His}

Why would I not be able to say that the AVN passes the wave of excitation down {Purkinje / Purkyne fibres / Bundle of His}? Is that wrong?
(edited 1 month ago)
Original post by TwisterBlade596
In a question I was doing about the role of the atrio-ventricular node and Bundle of His/Purkyne fibres, in the cardiac cycle, when I looked at the mark scheme, for example, for the atrio-ventricular node, it states:
passes {impulse/electrical signal} down {Purkinje / Purkyne fibres / Bundle of His}
Why would I not be able to say that the AVN passes the wave of excitation down {Purkinje / Purkyne fibres / Bundle of His}? Is that wrong?

I mean ‘Wave of excitation’ does not really seem that scientific. Personally, I would say wave of depolarisation (implying the Na+ involved in the membrane potentials).
But according to this mark scheme I don't think this would gain credit either because it is not in the curly arrows...☹️

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