Practice question

Go with B — Closing of Na⁺ channels. Within Sensory System Eye Physiology, that statement lines up with the standard definition and the usual exam wording you’ll see. In plain terms, excitable-cell physiology turns on membranes, ions, and signalling steps, and Closing of Na⁺ channels captures the correct piece of that story. Holding that picture in mind makes Closing of Na⁺ 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 Closing of Na⁺ channels.