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': 'In isometric exercise all are increased except: \nSelect and explain. \nA. Hea rate, B. Cardiac output, C. Mean aerial pressure, D. Systemic vascular resistance', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Systemic vascular resistance', 'role': 'assistant'}]