Practice question

SP-C (C) is the right choice. This sits at the heart of Cardiac Cycle and Regulation: the wording points straight to what is happening in the tissue or organ system. A useful study habit is to ask what the structure or process is for: SP-C is the option that correctly names the structure, process, or principle asked for in Cardiac Cycle and Regulation. That reasoning supports SP-C. One solid sentence about why this works is enough for recall — you do not need a long essay for every MCQ. When you practise, cover the choices first, write SP-C from memory, then reveal the letter — that habit builds real recall for Cardiac Cycle and Regulation.