Practice question
Question
Which blood vessel contains valves to prevent backflow?
Explanation
Answer: C) Vein. For Blood and their Component, once you lock onto the key mechanism or definition, Vein is the clear fit. If you restate the concept in your own words, Vein is the option that correctly names the structure, process, or principle asked for in Blood and their Component. So Vein is the clean, accurate selection. If a similar stem appears later, start from the same core fact and you will land on the same kind of answer. In class notes, highlight this same phrase next to the related diagram so the wording and the picture reinforce each other.