This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiac Output, Subject name: Physiology
If the ejection fraction increases, there will be a decrease in 
Select and explain. 
A. Cardiac output, B. End-systolic volume, C. Hea rate, D. Pulse pressure
B: End-systolic volume
Answer: B: End-systolic volume 
Explanation: An increase in ejection fraction means that a higher fraction of the end-diastolic volume is ejected in the stroke volume (e.g., because of the administration of a positive inotropic agent). When this situation occurs, the volume remaining in the ventricle after systole, the end-systolic volume, will be reduced. Cardiac output, pulse pressure, stroke volume, and systolic pressure will be increased.