Practice question

Go with B — Delayed closure of K+ channels. Within Action potential, that statement lines up with the standard definition and the usual exam wording you’ll see. In plain terms, cause and effect line up with Delayed closure of K+ channels — that is the mechanism or reason the stem is pointing to. Holding that picture in mind makes Delayed closure of K+ channels feel natural rather than something you only memorise. Link the term to a real body example (organ, tissue, or ion flow) so the idea stays concrete under exam pressure. A short mental diagram helps — start from stimulus or structure, follow the pathway, and stop at the functional result described by Delayed closure of K+ channels.