the possible effects of an increased red blood cell count on blood viscosity, blood flow and resistance. 6 Polycythemia, a high red blood cell count, can be the result of disease or as an adaptation to life at high altitudes. Select all the possible effects of an increased red blood cell count on blood viscosity, blood flow and resistance. Check All That Apply Increased blood viscosity ferences Increased resistance to flow Greater rate of blood flow Increased blood pressure Decreased blood viscosity