<prompt> In circulatory biomechanics which of the following is true?Blood viscosity is increased in anemiaBlood viscosity is decreased in polycythemiaCardiac output is increased in anemiaCardiac output is decreased in Beri-Beri  <response>: 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. 