Practice question

Go with C — 10%. Within Cardiac Cycle and Regulation, that statement lines up with the standard definition and the usual exam wording you’ll see. In plain terms, 10% is the option that correctly names the structure, process, or principle asked for in Cardiac Cycle and Regulation. Holding that picture in mind makes 10% 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 10%.