Practice question

Increasing Ca2+ channel opening (C) is the right choice. This sits at the heart of Cardiovascular System: Heart: 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: excitable-cell physiology turns on membranes, ions, and signalling steps, and Increasing Ca2+ channel opening captures the correct piece of that story. That reasoning supports Increasing Ca2+ channel opening. 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 Increasing Ca2+ channel opening from memory, then reveal the letter — that habit builds real recall for Cardiovascular System: Heart.