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': 'An increase in afterload and venous compliance can cause stroke volume to change from the point marked X to point: \nSelect and explain. \nA. A, B. C, C. D, D. E', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Starling curve above the one on which the X is marked will result from an increase\xa0in\xa0contractility\xa0or\xa0a\xa0decrease\xa0in\xa0afterload.\xa0\nThe Starling curve below the one on which\xa0the X is marked will result from a decrease in contractility or an increase in afterload.\nA\xa0mild hemorrhage, which causes a decrease in\xa0blood\xa0volume\xa0and\xa0pressure,\xa0will\xa0evoke\xa0the\xa0baroreceptor\xa0reflex,\xa0which\xa0produces an increase in contractility. The low blood\xa0volume decreases the end-diastolic volume. Therefore, the stroke volume will be at the\xa0point marked A.\nAn\xa0increase\xa0in\xa0afterload\xa0indicates\xa0that the new stroke volume will be on the lower\xa0curve.\xa0The\xa0increase\xa0in\xa0venous\xa0compliance results in a decrease in end-diastolic volume,\xa0and, therefore, the stroke volume will be at the point-marked E.', 'role': 'assistant'}]