This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
A patient suffers a severe hemorrhage resulting in a lowered mean aerial pressure. Which of the following would be elevated above normal levels? 
Select and explain. 
A. Splanchnic blood flow, B. Cardiopulmonary receptor activity, C. Right ventricular end-diastolic volume, D. Hea rate
D: Hea rate
Answer: D: Hea rate 
Explanation: The hea rate would be elevated by the increased sympathetic activity and decreased parasympathetic activity caused by the baroreceptor reflex.