@keranki Since the MCAT could refer to it as only the “AV node,” I’ve edited to make the full name & its abbreviation clear. In terms of the suggested change for “ly” in “electrically” to be placed outside of the cloze, I can understand how this would be helpful to identify what’s being asked of in the cloze - an adverb. Some find the placement of the “ly” confusing & the understanding that this c2 is asking of an adverb to be more intuitive based on context clues. I’ve kept it as it was originally but feel free to share any additional thoughts about this!