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
Cardiac output is determined by 
Select and explain. 
A. Ratio of organ to total peripheral resistance, B. Mean stroke volume, C. Mean BP, D. Contractility of hea
B: Mean stroke volume
Answer: B: Mean stroke volume 
Explanation: Cardiac o/p=stroke volume*Hea rate Therefore cardiac o/p is collectively regulated by Stroke volume and Hea rate Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No: 514