This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
[{'content': 'Windkessel effect is seen in - \nSelect and explain. \nA. Large elastic vessels, B. Capacitance vessels, C. Throughfare channels, D. Capillaries', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Large elastic vesselsLarge elastic arteries (windkessel vessels)* These vessels have well developed elastic laminae and therefore a lot of elastic tissue in their wall. The elastic walls prevent abrupt changes in BP a phenomenon called the Windkessel effect.* The walls are stretched during systole, preventing a sudden rise in BP. During diastole, the recoil back, preventing a sudden drop in BP.* Aorta and its immediate braches are windkessel vessels.", 'role': 'assistant'}]