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
In circulatory biomechanics which of the following is true? 
Select and explain. 
A. Blood viscosity is increased in anemia, B. Blood viscosity is decreased in polycythemia, C. Cardiac output is increased in anemia, D. Cardiac output is decreased in Beri-Beri
C: Cardiac output is increased in anemia
Answer: C: Cardiac output is increased in anemia 
Explanation: Ans. is 'c' i.e., Cardiac output is increased in anemia Cardiac output is increased in conditions which cause decrease in peripheral vascular resistance :- Exercise AV fistula or shunt Severe anemia Thyrotoxicosis Wet beri-beri About other options Blood viscosity is low in anemia and high in polycythemia.