This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Which of the following is not increased during isometric exercise? \nSelect and explain. \nA. Respiratory rate, B. Hea rate, C. Stroke volume, D. Total peripheral reisistance', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Net fall in total peripheral resistance due to vasodilation in exercising musclesWith the sta of an isometric muscle contraction, the hea rate rises, probably as a result of psychic stimuli acting on the medulla oblongataWithin a few seconds of the onset of an isometric muscle contraction, systolic and diastolic blood pressures rise sharply.The response to exercise involving isotonic muscle contraction is similar in that there is a prompt increase in hea rate, but different in that a marked increase in stroke volume occursIncreased O2 consumption result in increase of respiratory rateRef: Ganong&;s review of medical physiology 23rd edition pg no: 518', 'role': 'assistant'}]