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A 64 year man old collapses on the ward.He is drowsy. His pulse is 100 bpm and BP 90/50 mmHg. He is placed on a bed and his legs are passively raised to increase his cardiac output.What is the cause of elevation in his cardiac output?☐ A. Increased atrial contraction☐ B. Increased ventricular after-load☐ C. Increased ventricular pre-load☐ D. Reduced activation of aortic baroreceptors ☐ E. Reduced ventricular after-load

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