Practice question

Pick B: Prevent overfilling of heart. Thinking about Cardiovascular System: Heart in a practical way — what the structure does, or what the process achieves — leads you here. Clinically and academically, the same logic shows up again and again: the functional job described in the stem is exactly what Prevent overfilling of heart does in Cardiovascular System: Heart. Hence Prevent overfilling of heart is correct. Treat this as a building block for the rest of Cardiovascular System: Heart; neighbouring topics often reuse the same principle. Keep a one-line summary card for this idea and revisit it before the paper; short, repeated review beats long cramming sessions.