This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'When a person changes position from standing to lying down, following change is seen: \nSelect and explain. \nA. Hea rate increases, B. Venous return to hea increases immediately, C. Cerebral blood flow increases, D. Blood flow at apices of lung decreases', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Venous return to hea increases immediately In standing posture, 300- 500m1 of blood pools in venous capacitance vessels of lower extremities, which is immediately returned towards heaQ on assuming lying down posture. Cardiovascular system Onlying On standing - Stroke volume - Cardiac output - Venous return - Central blood pool Increase Decrease - Central venous pressure - Aerial BP - Abdominal & limb flow - Hea rate - Peripheral venous pooling - Total peripheral resistance Decrease Increase - Abdominal & limb resistance - Small vein pressure', 'role': 'assistant'}]