Practice question

Capillaries (D) is the right choice. This sits at the heart of Blood and their Component: 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: Capillaries is the option that correctly names the structure, process, or principle asked for in Blood and their Component. That reasoning supports Capillaries. 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 Capillaries from memory, then reveal the letter — that habit builds real recall for Blood and their Component.